diff --git a/ets2panda/checker/ETSAnalyzer.cpp b/ets2panda/checker/ETSAnalyzer.cpp
index 4748735b14712406ac39fcfd00a2bbfc502f3660..59bd40ad21836ad0a2fe90a17ee1ca6dc4dbfafc 100644
--- a/ets2panda/checker/ETSAnalyzer.cpp
+++ b/ets2panda/checker/ETSAnalyzer.cpp
@@ -462,6 +462,7 @@ checker::Type *ETSAnalyzer::Check(ir::ETSFunctionType *node) const
     checker->CheckFunctionSignatureAnnotations(node->Params(), node->TypeParams(), node->ReturnType());
 
     auto *signatureInfo = checker->ComposeSignatureInfo(node->TypeParams(), node->Params());
+    ES2PANDA_ASSERT(signatureInfo != nullptr);
     auto *returnType = node->IsExtensionFunction() && node->ReturnType()->IsTSThisType()
                            ? signatureInfo->params.front()->TsType()
                            : checker->ComposeReturnType(node->ReturnType(), node->IsAsync());
@@ -1795,9 +1796,7 @@ checker::Type *ETSAnalyzer::Check(ir::ConditionalExpression *expr) const
 static Type *TransformTypeForMethodReference(ETSChecker *checker, ir::Expression *const use, Type *type)
 {
     ES2PANDA_ASSERT(use->IsIdentifier() || use->IsMemberExpression());
-    if (!type->IsETSMethodType() ||
-        (use->IsMemberExpression() && use->AsMemberExpression()->PropVar() != nullptr &&
-         use->AsMemberExpression()->PropVar()->HasFlag(varbinder::VariableFlags::DYNAMIC))) {
+    if (!type->IsETSMethodType()) {
         return type;
     }
     auto const getUseSite = [use]() {
@@ -1863,6 +1862,7 @@ checker::Type *ETSAnalyzer::Check(ir::Identifier *expr) const
     }
 
     expr->SetTsType(identType);
+    ES2PANDA_ASSERT(identType != nullptr);
     if (!identType->IsTypeError()) {
         checker->Context().CheckIdentifierSmartCastCondition(expr);
     }
@@ -1977,6 +1977,7 @@ checker::Type *ETSAnalyzer::Check(ir::MemberExpression *expr) const
     auto *baseType = checker->GetNonConstantType(checker->GetApparentType(expr->Object()->Check(checker)));
     //  Note: don't use possible smart cast to null-like types.
     //        Such situation should be correctly resolved in the subsequent lowering.
+    ES2PANDA_ASSERT(baseType != nullptr);
     if (baseType->DefinitelyETSNullish() && expr->Object()->IsIdentifier()) {
         baseType = expr->Object()->AsIdentifier()->Variable()->TsType();
     }
@@ -2678,6 +2679,7 @@ static checker::Type *ComputeTypeOfType(ETSChecker *checker, checker::Type *argT
 {
     checker::Type *ret = nullptr;
     ArenaVector<checker::Type *> types(checker->ProgramAllocator()->Adapter());
+    ES2PANDA_ASSERT(argType != nullptr);
     if (argType->IsETSUnionType()) {
         for (auto *it : argType->AsETSUnionType()->ConstituentTypes()) {
             checker::Type *elType = ComputeTypeOfType(checker, it);
@@ -2719,6 +2721,7 @@ checker::Type *ETSAnalyzer::Check(ir::UnaryExpression *expr) const
                 checker::Type *type = checker->CreateETSBigIntLiteralType(argType->AsETSBigIntType()->GetValue());
 
                 // We do not need this const anymore as we are negating the bigint object in runtime
+                ES2PANDA_ASSERT(type != nullptr);
                 type->RemoveTypeFlag(checker::TypeFlag::CONSTANT);
                 expr->argument_->SetTsType(type);
                 expr->SetTsType(type);
@@ -3114,6 +3117,7 @@ checker::Type *ETSAnalyzer::Check(ir::AnnotationUsage *st) const
     ArenaUnorderedMap<util::StringView, ir::ClassProperty *> fieldMap {checker->ProgramAllocator()->Adapter()};
     for (auto *it : annoDecl->Properties()) {
         auto *field = it->AsClassProperty();
+        ES2PANDA_ASSERT(field->Id() != nullptr);
         fieldMap.insert(std::make_pair(field->Id()->Name(), field));
     }
 
@@ -3701,6 +3705,7 @@ checker::Type *ETSAnalyzer::Check(ir::TSAsExpression *expr) const
 
     checker->CheckAnnotations(expr->TypeAnnotation()->Annotations());
     auto *const targetType = expr->TypeAnnotation()->AsTypeNode()->GetType(checker);
+    ES2PANDA_ASSERT(targetType != nullptr);
     if (targetType->IsTypeError()) {
         return checker->InvalidateType(expr);
     }
diff --git a/ets2panda/checker/ETSchecker.cpp b/ets2panda/checker/ETSchecker.cpp
index d63dcd1f115ce06087e78d98a04ea7097d03f476..f04eba7c2b6b7bcfbb36bc65635c4c26333ccc5a 100644
--- a/ets2panda/checker/ETSchecker.cpp
+++ b/ets2panda/checker/ETSchecker.cpp
@@ -433,6 +433,7 @@ bool ETSChecker::IsClassStaticMethod(checker::ETSObjectType *objType, checker::S
                                      TypeFlag::ETS_STRING_ENUM | TypeFlag::READONLY | TypeFlag::BIGINT_LITERAL |
                                      TypeFlag::ETS_TYPE_ALIAS | TypeFlag::TYPE_ERROR;
 
+    CHECK_NOT_NULL(type);
     auto res = static_cast<checker::TypeFlag>(type->TypeFlags() & ~(TO_CLEAR));
     ES2PANDA_ASSERT_POS(res == TypeFlag::NONE || helpers::math::IsPowerOfTwo(res & ~(TypeFlag::NONE)),
                         ark::es2panda::GetPositionForDiagnostic());
diff --git a/ets2panda/checker/TSAnalyzer.cpp b/ets2panda/checker/TSAnalyzer.cpp
index 44d5a3d824525e69a8147a6a8d9e201a9fc4ca03..655c154d5f62250d0c9fb34c1864a88a80a7bb09 100644
--- a/ets2panda/checker/TSAnalyzer.cpp
+++ b/ets2panda/checker/TSAnalyzer.cpp
@@ -802,7 +802,7 @@ void TSAnalyzer::CheckNonComputed(checker::ObjectDescriptor *desc, ir::Expressio
     if (prop->Key()->IsNumberLiteral()) {
         memberVar->AddFlag(varbinder::VariableFlags::NUMERIC_NAME);
     }
-
+    ES2PANDA_ASSERT(desc != nullptr);
     varbinder::LocalVariable *foundMember = desc->FindProperty(propName);
     allPropertiesMap.insert({propName, it->Start()});
 
@@ -1740,6 +1740,7 @@ static void AddEnumValueDeclaration(checker::TSChecker *checker, double number,
         enumScope->AddDecl(checker->Allocator(), decl, ScriptExtension::TS);
         res = enumScope->FindLocal(memberStr, varbinder::ResolveBindingOptions::BINDINGS);
         ES2PANDA_ASSERT(res && res->IsEnumVariable());
+        ES2PANDA_ASSERT(enumVar != nullptr);
         enumVar = res->AsEnumVariable();
         enumVar->AsEnumVariable()->SetBackReference();
         enumVar->SetTsType(checker->GlobalStringType());
@@ -1747,6 +1748,7 @@ static void AddEnumValueDeclaration(checker::TSChecker *checker, double number,
         ES2PANDA_ASSERT(res->IsEnumVariable());
         enumVar = res->AsEnumVariable();
         auto *decl = checker->Allocator()->New<varbinder::EnumDecl>(memberStr);
+        ES2PANDA_ASSERT(decl != nullptr);
         decl->BindNode(variable->Declaration()->Node());
         enumVar->ResetDecl(decl);
     }
diff --git a/ets2panda/checker/ets/aliveAnalyzer.cpp b/ets2panda/checker/ets/aliveAnalyzer.cpp
index 13abe6b9ca76eb040ad9d23fb9dc050246f31104..e4edb04a7a1eadcccc752a94d25838480119604d 100644
--- a/ets2panda/checker/ets/aliveAnalyzer.cpp
+++ b/ets2panda/checker/ets/aliveAnalyzer.cpp
@@ -243,7 +243,9 @@ void AliveAnalyzer::AnalyzeMethodDef(const ir::MethodDefinition *methodDef)
     status_ = LivenessStatus::ALIVE;
     AnalyzeStat(func->Body());
     ES2PANDA_ASSERT(methodDef->TsType() && methodDef->TsType()->IsETSFunctionType());
-    const auto *returnType = methodDef->TsType()->AsETSFunctionType()->FindSignature(func)->ReturnType();
+    const auto *signature = methodDef->TsType()->AsETSFunctionType()->FindSignature(func);
+    ES2PANDA_ASSERT(signature != nullptr);
+    const auto *returnType = signature->ReturnType();
     const auto isVoid = returnType->IsETSVoidType() || returnType == checker_->GlobalVoidType();
 
     auto isPromiseVoid = false;
diff --git a/ets2panda/checker/ets/function.cpp b/ets2panda/checker/ets/function.cpp
index b10a5e7edbf30a99907595fac61122e3559db908..fd2d36b35fd451063f215c921ccb2d27627c3726 100644
--- a/ets2panda/checker/ets/function.cpp
+++ b/ets2panda/checker/ets/function.cpp
@@ -1647,6 +1647,7 @@ SignatureInfo *ETSChecker::ComposeSignatureInfo(ir::TSTypeParameterDeclaration *
                 ES2PANDA_ASSERT(IsAnyError());  // #23134
                 return nullptr;
             }
+            ES2PANDA_ASSERT(restParamType != nullptr);
             if (!restParamType->IsETSTupleType() && !restParamType->IsETSArrayType() &&
                 !restParamType->IsETSResizableArrayType()) {
                 LogError(diagnostic::ONLY_ARRAY_OR_TUPLE_FOR_REST, {}, param->Start());
diff --git a/ets2panda/checker/ets/helpers.cpp b/ets2panda/checker/ets/helpers.cpp
index 095b9f0503e36efd4eabfe0252c84ded480c63d2..306176bcb8292c41e03d1ff68199dbb31fcc1717 100644
--- a/ets2panda/checker/ets/helpers.cpp
+++ b/ets2panda/checker/ets/helpers.cpp
@@ -626,6 +626,7 @@ void ETSChecker::InferAliasLambdaType(ir::TypeNode *localTypeAnnotation, ir::Arr
 checker::Type *ETSChecker::FixOptionalVariableType(varbinder::Variable *const bindingVar, ir::ModifierFlags flags)
 {
     if ((flags & ir::ModifierFlags::OPTIONAL) != 0) {
+        ES2PANDA_ASSERT(bindingVar != nullptr);
         auto *variableType = bindingVar->TsType() != nullptr ? bindingVar->TsType() : GlobalTypeError();
         bindingVar->SetTsType(
             !variableType->IsTypeError() ? CreateETSUnionType({GlobalETSUndefinedType(), variableType}) : variableType);
diff --git a/ets2panda/checker/ets/utilityTypeHandlers.cpp b/ets2panda/checker/ets/utilityTypeHandlers.cpp
index 076bdb34bd08c8caf9ac3258f87e77f9533311fb..6341a07915301bb57b18aec8fe648f1f1b01d5b0 100644
--- a/ets2panda/checker/ets/utilityTypeHandlers.cpp
+++ b/ets2panda/checker/ets/utilityTypeHandlers.cpp
@@ -249,10 +249,11 @@ ir::ClassProperty *ETSChecker::CreateNullishPropertyFromAccessor(ir::MethodDefin
     auto *prop =
         // SUPPRESS_CSA_NEXTLINE(alpha.core.AllocatorETSCheckerHint)
         ProgramAllocator()->New<ir::ClassProperty>(ident, nullptr, nullptr, modifierFlag, ProgramAllocator(), false);
-
+    ES2PANDA_ASSERT(prop != nullptr);
     prop->SetParent(newClassDefinition);
     ident->SetParent(prop);
 
+    ES2PANDA_ASSERT(accessor->Function() != nullptr);
     prop->SetTypeAnnotation(accessor->Function()->IsGetter()
                                 ? accessor->Function()->ReturnTypeAnnotation()
                                 : accessor->Function()->Params()[0]->AsETSParameterExpression()->TypeAnnotation());
@@ -268,6 +269,7 @@ ir::ClassProperty *ETSChecker::CreateNullishPropertyFromAccessor(ir::MethodDefin
 
     auto callSign = accessor->TsType()->AsETSFunctionType()->CallSignatures()[0];
 
+    ES2PANDA_ASSERT(accessor->Function() != nullptr);
     auto tsType = accessor->Function()->IsGetter() ? callSign->ReturnType() : callSign->Params()[0]->TsType();
 
     // SUPPRESS_CSA_NEXTLINE(alpha.core.AllocatorETSCheckerHint)
diff --git a/ets2panda/checker/ts/destructuringContext.cpp b/ets2panda/checker/ts/destructuringContext.cpp
index 62212a8fcac53a0723d372e7ae9608ebbcab3005..b3f516e2b8800af19064d364d879d5e4c8a8ce20 100644
--- a/ets2panda/checker/ts/destructuringContext.cpp
+++ b/ets2panda/checker/ts/destructuringContext.cpp
@@ -332,6 +332,7 @@ Type *ArrayDestructuringContext::CreateTupleTypeForRest(TupleType *tuple)
         ES2PANDA_ASSERT(memberVar != nullptr);
         memberVar->SetTsType(tupleElementType);
         elementFlags.push_back(memberFlag);
+        ES2PANDA_ASSERT(desc != nullptr);
         desc->properties.push_back(memberVar);
 
         index_++;
diff --git a/ets2panda/checker/types/ets/etsAnyType.cpp b/ets2panda/checker/types/ets/etsAnyType.cpp
index 8f36fb2b2123613809dc8f798044a89eebd61803..ea399276063cd735fb696ab45e416260bd38d9f9 100644
--- a/ets2panda/checker/types/ets/etsAnyType.cpp
+++ b/ets2panda/checker/types/ets/etsAnyType.cpp
@@ -14,6 +14,7 @@
  */
 
 #include "etsAnyType.h"
+#include <cstddef>
 
 #include "checker/ETSchecker.h"
 #include "checker/ets/conversion.h"
@@ -62,6 +63,7 @@ void ETSAnyType::Cast(TypeRelation *relation, Type *target)
 
     if (relation->ApplyUnboxing()) {
         auto *const boxedTarget = relation->GetChecker()->AsETSChecker()->MaybeBoxInRelation(target);
+        ES2PANDA_ASSERT(boxedTarget != nullptr);
         conversion::Unboxing(relation, boxedTarget->AsETSObjectType());
         relation->Result(true);
     }
diff --git a/ets2panda/checker/types/typeRelation.cpp b/ets2panda/checker/types/typeRelation.cpp
index d6de75572207b5695a3c3cba510f209f23562674..67ba7f0312f8b46bccae7e90d3241842d4ee5883 100644
--- a/ets2panda/checker/types/typeRelation.cpp
+++ b/ets2panda/checker/types/typeRelation.cpp
@@ -161,6 +161,7 @@ bool TypeRelation::IsComparableTo(Type *source, Type *target)
 
         result_ = RelationResult::FALSE;
         target->Compare(this, source);
+        ES2PANDA_ASSERT(source != nullptr);
         auto key = RelationHolder::MakeKey(source->Id(), target->Id());
         checker_->ComparableResults().Insert(key, {result_, RelationType::COMPARABLE});
     }
diff --git a/ets2panda/compiler/core/ETSCompiler.cpp b/ets2panda/compiler/core/ETSCompiler.cpp
index 75fd7d3de505e7bba5f6d34adae7e5d6b9110aeb..83fd68fe4d82dfc509a6685c36c2fd060c3b72e2 100644
--- a/ets2panda/compiler/core/ETSCompiler.cpp
+++ b/ets2panda/compiler/core/ETSCompiler.cpp
@@ -757,7 +757,7 @@ void ETSCompiler::Compile(const ir::CallExpression *expr) const
     auto const callee = expr->Callee();
     checker::Signature *const signature = expr->Signature();
 
-    ES2PANDA_ASSERT(!callee->TsType()->IsETSArrowType());  // should have been lowered
+    ES2PANDA_ASSERT(!callee->TsType()->IsETSArrowType() || expr->IsDynamicCall());  // should have been lowered
 
     bool const isStatic = signature->HasSignatureFlag(checker::SignatureFlags::STATIC);
 
diff --git a/ets2panda/compiler/core/ETSGen.cpp b/ets2panda/compiler/core/ETSGen.cpp
index ff54d72f975078fcf116ca670ad2aae73e73232d..5b08e72fe6e600776d6686a52e1bd0f32e7d4ef2 100644
--- a/ets2panda/compiler/core/ETSGen.cpp
+++ b/ets2panda/compiler/core/ETSGen.cpp
@@ -675,6 +675,7 @@ void ETSGen::BranchIfIsInstance(const ir::AstNode *const node, const VReg srcReg
 void ETSGen::IsInstance(const ir::AstNode *const node, const VReg srcReg, const checker::Type *target)
 {
     target = Checker()->GetApparentType(target);
+    ES2PANDA_ASSERT(target != nullptr);
     ES2PANDA_ASSERT(target->IsETSReferenceType() && GetAccumulatorType() != nullptr);
 
     if (target->IsETSAnyType()) {  // should be IsSupertypeOf(target, source)
@@ -725,6 +726,7 @@ void ETSGen::InternalCheckCast(const ir::AstNode *node, const es2panda::checker:
 // Handle checkcast for interop if it is 1.2 type.
 void ETSGen::EmitAnyCheckCast(const ir::AstNode *node, const checker::Type *target)
 {
+    ES2PANDA_ASSERT(target != nullptr);
     if (!target->IsETSAnyType() &&
         (target->IsETSObjectType() || target->IsETSArrayType() || target->IsETSTupleType())) {
         InternalCheckCast(node, target);
@@ -779,6 +781,7 @@ void ETSGen::CheckedReferenceNarrowing(const ir::AstNode *node, const checker::T
     }
 
     target = Checker()->GetApparentType(target);
+    ES2PANDA_ASSERT(target != nullptr);
     ES2PANDA_ASSERT(target->IsETSReferenceType());
 
     if (target->IsETSAnyType()) {  // should be IsSupertypeOf(target, source)
@@ -815,6 +818,7 @@ void ETSGen::GuardUncheckedType(const ir::AstNode *node, const checker::Type *un
         CheckedReferenceNarrowing(node, Checker()->MaybeBoxType(target));
         // Because on previous step accumulator type may be set in CheckerReferenceNarrowing to boxed counterpart of
         // target We need to apply unbox conversion if needed to avoid RTE
+        ES2PANDA_ASSERT(GetAccumulatorType() != nullptr);
         if (target->IsETSPrimitiveType() && GetAccumulatorType()->IsETSUnboxableObject()) {
             ApplyConversion(node, target);
         }
@@ -1288,6 +1292,7 @@ void ETSGen::CastToInt(const ir::AstNode *node)
 
 void ETSGen::CastToReftype(const ir::AstNode *const node, const checker::Type *const targetType, const bool unchecked)
 {
+    ES2PANDA_ASSERT(GetAccumulatorType() != nullptr);
     ES2PANDA_ASSERT(GetAccumulatorType()->IsETSReferenceType());
 
     if (!unchecked) {
diff --git a/ets2panda/compiler/lowering/ets/lambdaLowering.cpp b/ets2panda/compiler/lowering/ets/lambdaLowering.cpp
index f621292487d3bbf1aea48fc397109aa79ad8969f..3533aac4ae84e59da7d534c5db9ecb518e517eb0 100644
--- a/ets2panda/compiler/lowering/ets/lambdaLowering.cpp
+++ b/ets2panda/compiler/lowering/ets/lambdaLowering.cpp
@@ -1311,14 +1311,15 @@ static ir::AstNode *BuildLambdaClassWhenNeeded(public_lib::Context *ctx, ir::Ast
         // so it is correct to pass ETS extension here to isReference()
         if (id->IsReference(ScriptExtension::ETS) && id->TsType() != nullptr && id->TsType()->IsETSFunctionType() &&
             !IsInCalleePosition(id) && !IsEnumFunctionCall(id) && IsValidFunctionDeclVar(var) &&
-            !id->Variable()->HasFlag(varbinder::VariableFlags::DYNAMIC) && !IsOverloadedName(id)) {
+            !IsOverloadedName(id)) {
             return ConvertFunctionReference(ctx, id);
         }
     }
     if (node->IsMemberExpression()) {
         auto *mexpr = node->AsMemberExpression();
         if (mexpr->Kind() == ir::MemberExpressionKind::PROPERTY_ACCESS && mexpr->TsType() != nullptr &&
-            mexpr->TsType()->IsETSFunctionType() && mexpr->Object()->TsType()->IsETSObjectType()) {
+            mexpr->TsType()->IsETSFunctionType() && mexpr->Object()->TsType()->IsETSObjectType() &&
+            mexpr->PropVar() != nullptr && !mexpr->PropVar()->HasFlag(varbinder::VariableFlags::DYNAMIC)) {
             ES2PANDA_ASSERT(mexpr->Property()->IsIdentifier());
             auto *var = mexpr->Object()->TsType()->AsETSObjectType()->GetProperty(
                 mexpr->Property()->AsIdentifier()->Name(),
diff --git a/ets2panda/ir/module/exportSpecifier.cpp b/ets2panda/ir/module/exportSpecifier.cpp
index 1133414d19f41eb489e3847f49e98fb98041246f..1c28d57fe53a0f57a6606771288018944388a220 100644
--- a/ets2panda/ir/module/exportSpecifier.cpp
+++ b/ets2panda/ir/module/exportSpecifier.cpp
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2021-2024 Huawei Device Co., Ltd.
+ * Copyright (c) 2021-2025 Huawei Device Co., Ltd.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -48,6 +48,12 @@ void ExportSpecifier::Dump(ir::AstDumper *dumper) const
 
 void ExportSpecifier::Dump(ir::SrcDumper *dumper) const
 {
+    if (GetConstantExpression() != nullptr) {
+        GetConstantExpression()->Dump(dumper);
+        dumper->Add("as default");
+        return;
+    }
+
     exported_->Dump(dumper);
 
     if (local_ != nullptr) {
diff --git a/ets2panda/parser/ASparser.cpp b/ets2panda/parser/ASparser.cpp
index f2567fef3d343350723a2e1b2eda79099eca4d4e..2e0e102951fd5e5354e778737b6ed345fbad31bc 100644
--- a/ets2panda/parser/ASparser.cpp
+++ b/ets2panda/parser/ASparser.cpp
@@ -1122,6 +1122,7 @@ ArenaVector<ir::TSClassImplements *> ASParser::ParseClassImplementClause()
 
         const lexer::SourcePosition &implementStart = Lexer()->GetToken().Start();
         auto *implementsName = AllocNode<ir::Identifier>(Lexer()->GetToken().Ident(), Allocator());
+        ES2PANDA_ASSERT(implementsName != nullptr);
         implementsName->SetRange(Lexer()->GetToken().Loc());
         auto *implementsClause = AllocNode<ir::NamedType>(implementsName, Allocator());
         ES2PANDA_ASSERT(implementsClause != nullptr);
@@ -1137,6 +1138,7 @@ ArenaVector<ir::TSClassImplements *> ASParser::ParseClassImplementClause()
             }
 
             implementsName = AllocNode<ir::Identifier>(Lexer()->GetToken().Ident(), Allocator());
+            ES2PANDA_ASSERT(implementsName != nullptr);
             implementsName->SetRange(Lexer()->GetToken().Loc());
             auto *next = AllocNode<ir::NamedType>(implementsName, Allocator());
             current->SetRange(Lexer()->GetToken().Loc());
@@ -1740,6 +1742,7 @@ ir::Statement *ASParser::ParseImportDeclaration([[maybe_unused]] StatementParsin
         source = ParseFromClause(false);
     }
 
+    ES2PANDA_ASSERT(source != nullptr);
     lexer::SourcePosition endLoc = source->End();
     auto *importDeclaration = AllocNode<ir::ImportDeclaration>(source, std::move(specifiers));
     ES2PANDA_ASSERT(importDeclaration != nullptr);
diff --git a/ets2panda/parser/ETSparser.cpp b/ets2panda/parser/ETSparser.cpp
index 5541ac57d5cccf3e8bd73bceeebf9e07e9ab73a1..f3e0f8afe480d312f6c47f15d97e473bf882e882 100644
--- a/ets2panda/parser/ETSparser.cpp
+++ b/ets2panda/parser/ETSparser.cpp
@@ -1027,6 +1027,7 @@ ir::TypeNode *ETSParser::ParseTypeReference(TypeAnnotationParsingOptions *option
         }
 
         typeRefPart = AllocNode<ir::ETSTypeReferencePart>(typeName, typeParams, typeRefPart, Allocator());
+        ES2PANDA_ASSERT(typeRefPart != nullptr);
         typeRefPart->SetRange({partPos, Lexer()->GetToken().End()});
 
         if (!Lexer()->TryEatTokenType(lexer::TokenType::PUNCTUATOR_PERIOD)) {
@@ -1119,21 +1120,41 @@ ir::Statement *ETSParser::CreateReExportDeclarationNode(ir::ETSImportDeclaration
     }
     auto reExport = AllocNode<ir::ETSReExportDeclaration>(reExportDeclaration, std::vector<std::string>(),
                                                           GetProgram()->AbsoluteName(), Allocator());
+    ES2PANDA_ASSERT(reExport != nullptr);
     reExport->AddModifier(modifiers);
     return reExport;
 }
 
+ir::Statement *ETSParser::ParseDefaultIfSingleExport(ir::ModifierFlags modifiers)
+{
+    auto tokenType = Lexer()->GetToken().Type();
+    if (tokenType != lexer::TokenType::PUNCTUATOR_LEFT_BRACE) {
+        return ParseSingleExport(modifiers);
+    }
+    auto savePos = Lexer()->Save();
+    Lexer()->NextToken();
+    auto isSelectiveExport = Lexer()->TryEatTokenType(lexer::TokenType::LITERAL_IDENT) &&
+                             (Lexer()->GetToken().Type() == lexer::TokenType::PUNCTUATOR_COMMA ||
+                              Lexer()->GetToken().Type() == lexer::TokenType::KEYW_AS ||
+                              Lexer()->GetToken().Type() == lexer::TokenType::PUNCTUATOR_RIGHT_BRACE);
+    Lexer()->Rewind(savePos);
+    return !isSelectiveExport ? ParseSingleExport(modifiers) : nullptr;
+}
+
 ir::Statement *ETSParser::ParseExport(lexer::SourcePosition startLoc, ir::ModifierFlags modifiers)
 {
     const size_t exportDefaultMaxSize = 1;
     if (!InAmbientContext() && (GetContext().Status() & ParserStatus::IN_NAMESPACE) != 0) {
         LogError(diagnostic::EXPORT_IN_NAMESPACE);
     }
-    [[maybe_unused]] auto tokenType = Lexer()->GetToken().Type();
     // export a constant variable anonymously, as export default new A()
-    if ((modifiers & ir::ModifierFlags::DEFAULT_EXPORT) != 0U && tokenType != lexer::TokenType::PUNCTUATOR_MULTIPLY &&
-        tokenType != lexer::TokenType::PUNCTUATOR_LEFT_BRACE && tokenType != lexer::TokenType::LITERAL_IDENT) {
-        return ParseSingleExport(modifiers);
+    if ((modifiers & ir::ModifierFlags::DEFAULT_EXPORT) != 0U &&
+        Lexer()->GetToken().Type() != lexer::TokenType::PUNCTUATOR_MULTIPLY &&
+        Lexer()->GetToken().Type() != lexer::TokenType::LITERAL_IDENT) {
+        auto exportedExpression = ParseDefaultIfSingleExport(modifiers);
+        if (exportedExpression != nullptr) {
+            return exportedExpression;
+        }
     }
 
     ArenaVector<ir::AstNode *> specifiers(Allocator()->Adapter());
@@ -1223,6 +1244,7 @@ ir::ETSImportDeclaration *ETSParser::ParseImportPathBuildImport(ArenaVector<ir::
         LogExpectedToken(lexer::TokenType::LITERAL_STRING);
         // Try to create DUMMY import source as error placeholder
         auto errorLiteral = AllocNode<ir::StringLiteral>(ERROR_LITERAL);
+        ES2PANDA_ASSERT(errorLiteral != nullptr);
         errorLiteral->SetRange(Lexer()->GetToken().Loc());
         auto *const importDeclaration = AllocNode<ir::ETSImportDeclaration>(
             errorLiteral, util::ImportPathManager::ImportMetadata {}, std::move(specifiers), importKind);
@@ -1312,6 +1334,7 @@ ArenaVector<ir::ETSImportDeclaration *> ETSParser::ParseImportDeclarations()
         auto pos = Lexer()->Save();
         if (!specifiers.empty()) {
             auto *const importDecl = ParseImportPathBuildImport(std::move(specifiers), true, startLoc, importKind);
+            ES2PANDA_ASSERT(importDecl != nullptr);
             statements.push_back(importDecl->AsETSImportDeclaration());
         }
 
@@ -1366,6 +1389,10 @@ ir::ExportNamedDeclaration *ETSParser::ParseSingleExport(ir::ModifierFlags modif
         return ParseSingleExportForAnonymousConst(modifiers);
     }
 
+    if (token.KeywordType() == lexer::TokenType::KEYW_AS) {
+        LogError(diagnostic::ERROR_ARKTS_NO_UMD, {}, token.Start());
+        return nullptr;
+    }
     if (token.Type() != lexer::TokenType::LITERAL_IDENT) {
         LogError(diagnostic::EXPORT_NON_DECLARATION, {}, token.Start());
         return nullptr;
@@ -1498,6 +1525,12 @@ SpecifiersInfo ETSParser::ParseNamedSpecifiers()
     ArenaVector<ir::ImportDefaultSpecifier *> resultDefault(Allocator()->Adapter());
     ArenaVector<ir::ExportSpecifier *> resultExportDefault(Allocator()->Adapter());
 
+    auto token = Lexer()->GetToken();
+    if (token.Ident() == (lexer::TokenToString(lexer::TokenType::KEYW_IMPORT)) &&
+        token.Type() == lexer::TokenType::PUNCTUATOR_RIGHT_BRACE) {
+        LogError(diagnostic::ERROR_ARKTS_NO_SIDE_EFFECT_IMPORT);
+    }
+
     ParseList(
         lexer::TokenType::PUNCTUATOR_RIGHT_BRACE, lexer::NextTokenFlags::KEYWORD_TO_IDENT,
         [this, &result, &resultDefault, &resultExportDefault, &fileName]() {
@@ -1552,6 +1585,10 @@ void ETSParser::ParseNameSpaceSpecifier(ArenaVector<ir::AstNode *> *specifiers,
 
 ir::AstNode *ETSParser::ParseImportDefaultSpecifier(ArenaVector<ir::AstNode *> *specifiers)
 {
+    if (Lexer()->GetToken().Type() == lexer::TokenType::LITERAL_STRING) {
+        LogError(diagnostic::ERROR_ARKTS_NO_SIDE_EFFECT_IMPORT);
+        return nullptr;
+    }
     if (Lexer()->GetToken().Type() != lexer::TokenType::LITERAL_IDENT) {
         LogExpectedToken(lexer::TokenType::LITERAL_IDENT);
     }
@@ -1605,6 +1642,7 @@ ir::AnnotatedExpression *ETSParser::GetAnnotatedExpressionFromParam()
     switch (Lexer()->GetToken().Type()) {
         case lexer::TokenType::LITERAL_IDENT: {
             parameter = AllocNode<ir::Identifier>(Lexer()->GetToken().Ident(), Allocator());
+            ES2PANDA_ASSERT(parameter != nullptr);
             if (parameter->AsIdentifier()->Decorators().empty()) {
                 parameter->SetRange(Lexer()->GetToken().Loc());
             } else {
@@ -1627,6 +1665,7 @@ ir::AnnotatedExpression *ETSParser::GetAnnotatedExpressionFromParam()
             restIdent->SetRange(Lexer()->GetToken().Loc());
 
             parameter = AllocNode<ir::SpreadElement>(ir::AstNodeType::REST_ELEMENT, Allocator(), restIdent);
+            ES2PANDA_ASSERT(parameter != nullptr);
             parameter->SetRange({startLoc, Lexer()->GetToken().End()});
             break;
         }
@@ -2322,6 +2361,7 @@ ir::FunctionDeclaration *ETSParser::ParseFunctionDeclaration(bool canBeAnonymous
         Lexer()->NextToken();
     }
 
+    ES2PANDA_ASSERT(funcDecl != nullptr);
     funcDecl->SetRange(func->Range());
     func->AddModifier(modifiers);
     func->SetStart(startLoc);
diff --git a/ets2panda/parser/ETSparser.h b/ets2panda/parser/ETSparser.h
index 8dddff53b552b11d0a614b68096e469630cd1ceb..1958159166b970eb1bbebaa2b23aa99267009c16 100644
--- a/ets2panda/parser/ETSparser.h
+++ b/ets2panda/parser/ETSparser.h
@@ -18,7 +18,6 @@
 
 #include "util/arktsconfig.h"
 #include "util/importPathManager.h"
-#include "util/recursiveGuard.h"
 #include "innerSourceParser.h"
 #include "TypedParser.h"
 #include "ir/base/classDefinition.h"
@@ -302,6 +301,7 @@ private:
         ExpressionParseFlags flags = ExpressionParseFlags::NO_OPTS) override;
     ir::Statement *ParseTryStatement() override;
     ir::Statement *ParseDebuggerStatement() override;
+    ir::Statement *ParseDefaultIfSingleExport(ir::ModifierFlags modifiers);
     ir::Statement *ParseExport(lexer::SourcePosition startLoc, ir::ModifierFlags modifiers);
     ir::Statement *ParseImportDeclaration(StatementParsingFlags flags) override;
     ir::Statement *ParseExportDeclaration(StatementParsingFlags flags) override;
@@ -458,7 +458,6 @@ private:
 
     friend class ExternalSourceParser;
     friend class InnerSourceParser;
-    friend ir::Expression *HandleLeftParanthesis(ETSParser *parser, ExpressionParseFlags flags);
 
 private:
     uint32_t namespaceNestedRank_;
@@ -468,7 +467,6 @@ private:
     parser::Program *globalProgram_;
     std::vector<ir::AstNode *> insertingNodes_ {};
     std::unique_ptr<util::ImportPathManager> importPathManager_ {nullptr};
-    RecursiveContext recursiveCtx_;
 };
 
 class ExternalSourceParser {
diff --git a/ets2panda/parser/ETSparserAnnotations.cpp b/ets2panda/parser/ETSparserAnnotations.cpp
index 218b519d199fa6a4d8a9327246ff00aacc7cb6f8..cdf4dfb5d05b408c149bf73bba8ab6c6bf43c8ec 100644
--- a/ets2panda/parser/ETSparserAnnotations.cpp
+++ b/ets2panda/parser/ETSparserAnnotations.cpp
@@ -392,6 +392,7 @@ ir::AnnotationUsage *ETSParser::ParseAnnotationUsage()
         } else if (Lexer()->GetToken().Type() != lexer::TokenType::PUNCTUATOR_RIGHT_PARENTHESIS) {
             // handle single field annotation
             auto *singleParamName = AllocNode<ir::Identifier>(compiler::Signatures::ANNOTATION_KEY_VALUE, Allocator());
+            ES2PANDA_ASSERT(singleParamName != nullptr);
             singleParamName->SetRange({Lexer()->GetToken().Start(), Lexer()->GetToken().End()});
 
             const auto savePos = Lexer()->GetToken().Start();
diff --git a/ets2panda/parser/ETSparserClasses.cpp b/ets2panda/parser/ETSparserClasses.cpp
index fd98217de54e735976de68665cdf47d92f3f78b6..5f850708be761f4d726f8bc6dc64567d341dc5b2 100644
--- a/ets2panda/parser/ETSparserClasses.cpp
+++ b/ets2panda/parser/ETSparserClasses.cpp
@@ -421,6 +421,7 @@ ir::TypeNode *ETSParser::ConvertToOptionalUnionType(ir::TypeNode *typeAnno)
         types.push_back(AllocNode<ir::ETSUndefinedType>(Allocator()));
         types.back()->SetRange(typeAnno->Range());
         auto *newTypeAnno = AllocNode<ir::ETSUnionType>(std::move(types), Allocator());
+        ES2PANDA_ASSERT(newTypeAnno != nullptr);
         newTypeAnno->SetRange(typeAnno->Range());
         return newTypeAnno;
     }
@@ -596,6 +597,7 @@ ir::MethodDefinition *ETSParser::ParseClassMethodDefinition(ir::Identifier *meth
     funcExpr->SetRange(func->Range());
     func->AddModifier(modifiers);
 
+    ES2PANDA_ASSERT(methodName->Clone(Allocator(), nullptr) != nullptr);
     auto *method = AllocNode<ir::MethodDefinition>(methodKind, methodName->Clone(Allocator(), nullptr)->AsExpression(),
                                                    funcExpr, modifiers, Allocator(), false);
     ES2PANDA_ASSERT(method != nullptr);
@@ -634,6 +636,7 @@ ir::MethodDefinition *ETSParser::ParseClassMethod(ClassElementDescriptor *desc,
     auto *method =
         AllocNode<ir::MethodDefinition>(desc->methodKind, propName->Clone(Allocator(), nullptr)->AsExpression(),
                                         funcExpr, desc->modifiers, Allocator(), desc->isComputed);
+    ES2PANDA_ASSERT(method != nullptr);
     method->SetRange(funcExpr->Range());
 
     return method;
@@ -841,13 +844,16 @@ ir::MethodDefinition *ETSParser::ParseClassGetterSetterMethod(const ArenaVector<
 
     lexer::SourcePosition propEnd = methodName->End();
     ir::MethodDefinition *method = ParseClassMethod(&desc, properties, methodName, &propEnd);
+    ES2PANDA_ASSERT(method != nullptr);
     method->SetDefaultAccessModifier(isDefault);
-    method->Function()->AddModifier(desc.modifiers);
+    auto *func = method->Function();
+    ES2PANDA_ASSERT(func != nullptr);
+    func->AddModifier(desc.modifiers);
     method->SetRange({desc.propStart, propEnd});
     if (desc.methodKind == ir::MethodDefinitionKind::GET) {
-        method->Function()->AddFlag(ir::ScriptFunctionFlags::GETTER);
+        func->AddFlag(ir::ScriptFunctionFlags::GETTER);
     } else {
-        method->Function()->AddFlag(ir::ScriptFunctionFlags::SETTER);
+        func->AddFlag(ir::ScriptFunctionFlags::SETTER);
     }
 
     return method;
@@ -864,23 +870,25 @@ ir::MethodDefinition *ETSParser::ParseInterfaceGetterSetterMethod(const ir::Modi
         return nullptr;
     }
     method->AddModifier(ir::ModifierFlags::PUBLIC);
-    auto id = method->Id();
+    auto *id = method->Id();
+    auto *func = method->Function();
     ES2PANDA_ASSERT(id != nullptr);
+    ES2PANDA_ASSERT(func != nullptr);
     if (methodKind == ir::MethodDefinitionKind::GET) {
         id->SetAccessor();
-        method->Function()->AddFlag(ir::ScriptFunctionFlags::GETTER);
+        func->AddFlag(ir::ScriptFunctionFlags::GETTER);
     } else {
         id->SetMutator();
-        method->Function()->AddFlag(ir::ScriptFunctionFlags::SETTER);
+        func->AddFlag(ir::ScriptFunctionFlags::SETTER);
     }
     method->AddModifier(ir::ModifierFlags::PUBLIC);
 
-    method->Function()->SetIdent(id->Clone(Allocator(), nullptr));
-    method->Function()->AddModifier(method->Modifiers());
+    func->SetIdent(id->Clone(Allocator(), nullptr));
+    func->AddModifier(method->Modifiers());
 
-    bool hasReturn = method->Function()->ReturnTypeAnnotation() != nullptr;
+    bool hasReturn = func->ReturnTypeAnnotation() != nullptr;
     if (hasReturn && methodKind == ir::MethodDefinitionKind::SET) {
-        LogError(diagnostic::SETTER_NO_RETURN_TYPE, {}, method->Function()->Range().start);
+        LogError(diagnostic::SETTER_NO_RETURN_TYPE, {}, func->Range().start);
     }
 
     return method;
@@ -1110,6 +1118,7 @@ ir::AstNode *ETSParser::ParseInterfaceField()
         return AllocBrokenExpression(Lexer()->GetToken().Start());
     }
 
+    ES2PANDA_ASSERT(name != nullptr);
     name->SetRange(Lexer()->GetToken().Loc());
     Lexer()->NextToken();
     bool optionalField = false;
@@ -1179,6 +1188,7 @@ ir::MethodDefinition *ETSParser::ParseInterfaceMethod(ir::ModifierFlags flags, i
         name = AllocBrokenExpression(Lexer()->GetToken().Loc());
     } else {
         name = AllocNode<ir::Identifier>(Lexer()->GetToken().Ident(), Allocator());
+        ES2PANDA_ASSERT(name != nullptr);
         name->SetRange(Lexer()->GetToken().Loc());
         Lexer()->NextToken();
     }
@@ -1227,8 +1237,10 @@ ir::MethodDefinition *ETSParser::ParseInterfaceMethod(ir::ModifierFlags flags, i
     func->AddFlag(ir::ScriptFunctionFlags::METHOD);
 
     func->SetIdent(name);
+    ES2PANDA_ASSERT(name->Clone(Allocator(), nullptr) != nullptr);
     auto *method = AllocNode<ir::MethodDefinition>(methodKind, name->Clone(Allocator(), nullptr)->AsExpression(),
                                                    funcExpr, flags, Allocator(), false);
+    ES2PANDA_ASSERT(method != nullptr);
     method->SetRange(funcExpr->Range());
 
     ConsumeSemicolon(method);
diff --git a/ets2panda/parser/ETSparserExpressions.cpp b/ets2panda/parser/ETSparserExpressions.cpp
index d07eb0720854ac4c231c499b1cf588e204658bdc..7422c412b5111d45bb65aa0f52958e16842cffa7 100644
--- a/ets2panda/parser/ETSparserExpressions.cpp
+++ b/ets2panda/parser/ETSparserExpressions.cpp
@@ -41,11 +41,11 @@ static std::string GetArgumentsSourceView(lexer::Lexer *lexer, const util::Strin
 ir::Expression *ETSParser::ParseFunctionParameterExpression(ir::AnnotatedExpression *const paramIdent, bool isOptional)
 {
     ir::ETSParameterExpression *paramExpression;
+    ES2PANDA_ASSERT(paramIdent != nullptr);
     if (Lexer()->GetToken().Type() == lexer::TokenType::PUNCTUATOR_SUBSTITUTION) {
         auto const lexerPos = Lexer()->Save().Iterator();
         Lexer()->NextToken();  // eat '='
 
-        ES2PANDA_ASSERT(paramIdent != nullptr);
         if (paramIdent->IsRestElement()) {
             LogError(diagnostic::NO_DEFAULT_FOR_REST);
         }
@@ -76,9 +76,11 @@ ir::Expression *ETSParser::ParseFunctionParameterExpression(ir::AnnotatedExpress
         paramExpression->SetRange({paramIdent->Start(), paramExpression->Initializer()->End()});
     } else if (paramIdent->IsIdentifier()) {
         paramExpression = AllocNode<ir::ETSParameterExpression>(paramIdent->AsIdentifier(), isOptional, Allocator());
+        ES2PANDA_ASSERT(paramExpression != nullptr);
         paramExpression->SetRange({paramIdent->Start(), paramIdent->End()});
     } else {
         paramExpression = AllocNode<ir::ETSParameterExpression>(paramIdent->AsRestElement(), false, Allocator());
+        ES2PANDA_ASSERT(paramExpression != nullptr);
         paramExpression->SetRange({paramIdent->Start(), paramIdent->End()});
     }
     return paramExpression;
@@ -181,6 +183,7 @@ ir::Expression *ETSParser::ParseUnaryOrPrefixUpdateExpression(ExpressionParseFla
     }
 
     ir::Expression *returnExpr = CreateUnaryExpressionFromArgument(argument, operatorType, beginningChar);
+    ES2PANDA_ASSERT(returnExpr != nullptr);
     returnExpr->SetRange({start, argument->End()});
     return returnExpr;
 }
@@ -218,6 +221,7 @@ ir::Expression *ETSParser::ParsePropertyDefinition(ExpressionParseFlags flags)
     if (propertyKind == ir::PropertyKind::INIT) {
         returnProperty =
             AllocNode<ir::Property>(propertyKind, key, value, methodStatus != ParserStatus::NO_OPTS, isComputed);
+        ES2PANDA_ASSERT(returnProperty != nullptr);
         returnProperty->SetRange({start, end});
     } else {
         returnProperty = AllocBrokenExpression(key->Start());
@@ -317,26 +321,20 @@ ir::Expression *ETSParser::ParsePrimaryExpressionWithLiterals(ExpressionParseFla
     }
 }
 
-// This function is used to handle the left parenthesis in the expression parsing.
-ir::Expression *HandleLeftParanthesis(ETSParser *parser, ExpressionParseFlags flags)
+// NOLINTNEXTLINE(google-default-arguments)
+ir::Expression *ETSParser::ParsePrimaryExpression(ExpressionParseFlags flags)
 {
-    TrackRecursive trackRecursive(parser->recursiveCtx_);
+    TrackRecursive trackRecursive(RecursiveCtx());
     if (!trackRecursive) {
-        parser->LogError(diagnostic::DEEP_NESTING);
-        while (parser->Lexer()->GetToken().Type() != lexer::TokenType::EOS) {
-            parser->Lexer()->NextToken();
+        LogError(diagnostic::DEEP_NESTING);
+        while (Lexer()->GetToken().Type() != lexer::TokenType::EOS) {
+            Lexer()->NextToken();
         }
-        return parser->AllocBrokenExpression(parser->Lexer()->GetToken().Loc());
+        return AllocBrokenExpression(Lexer()->GetToken().Loc());
     }
-    return parser->ParseCoverParenthesizedExpressionAndArrowParameterList(flags);
-}
-
-// NOLINTNEXTLINE(google-default-arguments)
-ir::Expression *ETSParser::ParsePrimaryExpression(ExpressionParseFlags flags)
-{
     switch (Lexer()->GetToken().Type()) {
         case lexer::TokenType::PUNCTUATOR_LEFT_PARENTHESIS: {
-            return HandleLeftParanthesis(this, flags);
+            return ParseCoverParenthesizedExpressionAndArrowParameterList(flags);
         }
         case lexer::TokenType::KEYW_THIS: {
             return ParseThisExpression();
diff --git a/ets2panda/parser/ETSparserNamespaces.cpp b/ets2panda/parser/ETSparserNamespaces.cpp
index d60297de79692aaacc29201b9351696b2f691a3a..807b70099f039358c0c1ddfda821909e23d78256 100644
--- a/ets2panda/parser/ETSparserNamespaces.cpp
+++ b/ets2panda/parser/ETSparserNamespaces.cpp
@@ -71,6 +71,7 @@ ir::ETSModule *ETSParser::ParseNamespaceImp(ir::ModifierFlags flags)
     auto *result =
         AllocNode<ir::ETSModule>(Allocator(), ArenaVector<ir::Statement *>(Allocator()->Adapter()), ExpectIdentifier(),
                                  ir::ModuleFlag::NAMESPACE, GetContext().GetLanguage(), globalProgram_);
+    ES2PANDA_ASSERT(result != nullptr);
     ir::ETSModule *parent = result;
     ir::ETSModule *child = nullptr;
     while (Lexer()->GetToken().Type() == lexer::TokenType::PUNCTUATOR_PERIOD) {
diff --git a/ets2panda/parser/ETSparserTypes.cpp b/ets2panda/parser/ETSparserTypes.cpp
index c27206d4813f0677d0009c6b8c18d75a178e1f32..00c8ace6b2cc55a14aa52faa1a082c1693ad10f2 100644
--- a/ets2panda/parser/ETSparserTypes.cpp
+++ b/ets2panda/parser/ETSparserTypes.cpp
@@ -178,6 +178,7 @@ ir::TypeNode *ETSParser::ParseWildcardType(TypeAnnotationParsingOptions *options
     ir::ETSTypeReference *typeReference = nullptr;
     if (!isUnboundOut) {
         auto reference = ParseTypeReference(options);
+        ES2PANDA_ASSERT(reference != nullptr);
         typeReference = reference->AsETSTypeReference();
     }
 
diff --git a/ets2panda/parser/TSparser.cpp b/ets2panda/parser/TSparser.cpp
index d2545ce4258ac527a5c3a340bb71ad14c40648a6..4c41a234a3ed0717b0f5940f822f92b59b496a69 100644
--- a/ets2panda/parser/TSparser.cpp
+++ b/ets2panda/parser/TSparser.cpp
@@ -515,7 +515,7 @@ ir::TypeNode *TSParser::ParseTypeOperatorOrTypeReference()
         }
 
         auto *typeOperator = AllocNode<ir::TSTypeOperator>(type, ir::TSOperatorType::READONLY, Allocator());
-
+        ES2PANDA_ASSERT(typeOperator != nullptr);
         typeOperator->SetRange({typeOperatorStart, type->End()});
 
         return typeOperator;
@@ -1934,6 +1934,7 @@ ir::MethodDefinition *TSParser::ParseClassMethod(ClassElementDescriptor *desc,
     }
 
     auto *funcExpr = AllocNode<ir::FunctionExpression>(func);
+    ES2PANDA_ASSERT(funcExpr != nullptr);
     funcExpr->SetRange(func->Range());
 
     if (desc->methodKind == ir::MethodDefinitionKind::SET) {
@@ -1946,6 +1947,7 @@ ir::MethodDefinition *TSParser::ParseClassMethod(ClassElementDescriptor *desc,
     func->AddFlag(ir::ScriptFunctionFlags::METHOD);
     auto *method = AllocNode<ir::MethodDefinition>(desc->methodKind, propName, funcExpr, desc->modifiers, Allocator(),
                                                    desc->isComputed);
+    ES2PANDA_ASSERT(method != nullptr);
     method->SetRange(funcExpr->Range());
 
     return method;
diff --git a/ets2panda/parser/expressionParser.cpp b/ets2panda/parser/expressionParser.cpp
index 596a70e086461c7b6ffc6648ae3bc186c78da65e..89cd7fa0698f0e5de84cc37f8b57832665a8f888 100644
--- a/ets2panda/parser/expressionParser.cpp
+++ b/ets2panda/parser/expressionParser.cpp
@@ -348,6 +348,7 @@ ir::ArrowFunctionExpression *ParserImpl::ParseArrowFunctionExpressionBody(ArrowF
     funcNode->SetRange({desc->startLoc, endLoc});
 
     auto *arrowFuncNode = AllocNode<ir::ArrowFunctionExpression>(funcNode, Allocator());
+    ES2PANDA_ASSERT(arrowFuncNode != nullptr);
     arrowFuncNode->SetRange(funcNode->Range());
 
     return arrowFuncNode;
@@ -1599,6 +1600,9 @@ ir::MemberExpression *ParserImpl::ParsePrivatePropertyAccess(ir::Expression *pri
 
     auto *privateIdent = AllocNode<ir::Identifier>(lexer_->GetToken().Ident(), Allocator());
     ES2PANDA_ASSERT(privateIdent != nullptr);
+    if (program_->Extension() == util::gen::extension::ETS && privateIdent->Name().Is("prototype")) {
+        LogError(diagnostic::PROTOTYPE_ACCESS);
+    }
     privateIdent->SetRange({memberStart, lexer_->GetToken().End()});
     privateIdent->SetPrivate(true);
     lexer_->NextToken();
@@ -1613,6 +1617,9 @@ ir::MemberExpression *ParserImpl::ParsePrivatePropertyAccess(ir::Expression *pri
 ir::MemberExpression *ParserImpl::ParsePropertyAccess(ir::Expression *primaryExpr, bool isOptional)
 {
     ir::Identifier *ident = ExpectIdentifier(true);
+    if (program_->Extension() == util::gen::extension::ETS && ident->Name().Is("prototype")) {
+        LogError(diagnostic::PROTOTYPE_ACCESS);
+    }
     auto *memberExpr = AllocNode<ir::MemberExpression>(primaryExpr, ident, ir::MemberExpressionKind::PROPERTY_ACCESS,
                                                        false, isOptional);
     ES2PANDA_ASSERT(memberExpr != nullptr);
@@ -2370,7 +2377,7 @@ ir::Expression *ParserImpl::ParseUnaryOrPrefixUpdateExpression(ExpressionParseFl
         returnExpr = AllocNode<ir::UnaryExpression>(argument, operatorType);
     }
 
-    ES2PANDA_ASSERT(returnExpr);
+    ES2PANDA_ASSERT(returnExpr != nullptr);
     returnExpr->SetRange({start, end});
 
     return returnExpr;
@@ -2416,6 +2423,7 @@ ir::Expression *ParserImpl::ParseImportExpression()
     ExpectToken(lexer::TokenType::PUNCTUATOR_RIGHT_PARENTHESIS);
 
     auto *importExpression = AllocNode<ir::ImportExpression>(source);
+    ES2PANDA_ASSERT(importExpression != nullptr);
     importExpression->SetRange({startLoc, endImportLoc});
 
     return importExpression;
@@ -2451,6 +2459,7 @@ ir::FunctionExpression *ParserImpl::ParseFunctionExpression(ParserStatus newStat
     }
 
     ir::ScriptFunction *functionNode = ParseFunction(newStatus);
+    ES2PANDA_ASSERT(functionNode != nullptr);
     functionNode->SetStart(startLoc);
 
     auto *funcExpr = AllocNode<ir::FunctionExpression>(ident, functionNode);
diff --git a/ets2panda/parser/parserImpl.cpp b/ets2panda/parser/parserImpl.cpp
index 2b6e9ce4816286d4105e555eacad3119d6577124..ae8dd74781d50bb3b1465ff32ce5539263797beb 100644
--- a/ets2panda/parser/parserImpl.cpp
+++ b/ets2panda/parser/parserImpl.cpp
@@ -480,6 +480,7 @@ ir::MethodDefinition *ParserImpl::ParseClassMethod(ClassElementDescriptor *desc,
                       : propName;
     auto *method = AllocNode<ir::MethodDefinition>(desc->methodKind, ident, funcExpr, desc->modifiers, Allocator(),
                                                    desc->isComputed);
+    ES2PANDA_ASSERT(method != nullptr);
     method->SetRange(funcExpr->Range());
 
     return method;
@@ -495,6 +496,7 @@ ir::ClassElement *ParserImpl::ParseClassProperty(ClassElementDescriptor *desc,
 
     if (desc->classMethod) {
         property = ParseClassMethod(desc, properties, propName, &propEnd);
+        ES2PANDA_ASSERT(property != nullptr);
         property->SetRange({desc->propStart, propEnd});
         return property;
     }
@@ -514,7 +516,7 @@ ir::ClassElement *ParserImpl::ParseClassProperty(ClassElementDescriptor *desc,
 
     property =
         AllocNode<ir::ClassProperty>(propName, value, typeAnnotation, desc->modifiers, Allocator(), desc->isComputed);
-
+    ES2PANDA_ASSERT(property != nullptr);
     property->SetRange({desc->propStart, propEnd});
 
     return property;
@@ -685,6 +687,7 @@ ir::MethodDefinition *ParserImpl::BuildImplicitConstructor(ir::ClassDefinitionMo
     auto *key = AllocNode<ir::Identifier>("constructor", Allocator());
 
     if ((modifiers & ir::ClassDefinitionModifiers::SET_CTOR_ID) != 0U) {
+        ES2PANDA_ASSERT(key != nullptr);
         func->SetIdent(key->Clone(Allocator(), nullptr));
     }
 
@@ -710,6 +713,7 @@ void ParserImpl::CreateImplicitConstructor(ir::MethodDefinition *&ctor,
 
     ctor = BuildImplicitConstructor(modifiers, startLoc);
     if ((flags & ir::ModifierFlags::DECLARE) != 0) {
+        ES2PANDA_ASSERT(ctor != nullptr);
         auto *ctorFunc = ctor->Function();
         ES2PANDA_ASSERT(ctorFunc != nullptr);
         ctorFunc->AddFlag(ir::ScriptFunctionFlags::EXTERNAL);
diff --git a/ets2panda/parser/parserImpl.h b/ets2panda/parser/parserImpl.h
index 533f14d32c005e746bcc9d8da0ab8a9d2b849022..2cac251c9d10acc503a3fd56626ace549c7a19c4 100644
--- a/ets2panda/parser/parserImpl.h
+++ b/ets2panda/parser/parserImpl.h
@@ -26,6 +26,7 @@
 #include "parser/program/program.h"
 #include "util/diagnosticEngine.h"
 #include "util/helpers.h"
+#include "util/recursiveGuard.h"
 
 namespace ark::es2panda::lexer {
 class RegExpParser;
@@ -573,6 +574,11 @@ protected:
                    const std::function<bool()> &parseElement, lexer::SourcePosition *sourceEnd = nullptr,
                    bool allowTrailingSep = false);
 
+    RecursiveContext &RecursiveCtx()
+    {
+        return recursiveCtx_;
+    }
+
 private:
     bool GetCanBeForInOf(ir::Expression *leftNode, ir::AstNode *initNode);
     Program *program_;
@@ -583,6 +589,7 @@ private:
     const util::Options *options_;
     util::DiagnosticEngine &diagnosticEngine_;
     public_lib::Context *ctx_ {nullptr};
+    RecursiveContext recursiveCtx_;
 };
 }  // namespace ark::es2panda::parser
 
diff --git a/ets2panda/parser/statementParser.cpp b/ets2panda/parser/statementParser.cpp
index c311d81ec3c170237f0a2cf9d0b9b75b1e3eee7e..7452dc84bb6acc6c691149a0dd915a92a2c7f726 100644
--- a/ets2panda/parser/statementParser.cpp
+++ b/ets2panda/parser/statementParser.cpp
@@ -63,6 +63,7 @@
 #include "lexer/lexer.h"
 #include "lexer/token/letters.h"
 #include "lexer/token/sourceLocation.h"
+#include "util/recursiveGuard.h"
 #include "util/ustring.h"
 #include "generated/diagnostic.h"
 
@@ -91,6 +92,14 @@ ir::Statement *ParserImpl::ParseStatementLiteralIdentHelper(StatementParsingFlag
 // NOLINTNEXTLINE(google-default-arguments)
 ir::Statement *ParserImpl::ParseStatementPunctuatorsHelper(StatementParsingFlags flags)
 {
+    TrackRecursive trackRecursive(RecursiveCtx());
+    if (!trackRecursive) {
+        LogError(diagnostic::DEEP_NESTING);
+        while (Lexer()->GetToken().Type() != lexer::TokenType::EOS) {
+            Lexer()->NextToken();
+        }
+        return AllocBrokenStatement(Lexer()->GetToken().Loc());
+    }
     switch (lexer_->GetToken().Type()) {
         case lexer::TokenType::PUNCTUATOR_LEFT_BRACE:
             return ParseBlockStatement();
@@ -525,9 +534,11 @@ ir::Statement *ParserImpl::ParseBreakStatement()
     }
 
     auto *identNode = AllocNode<ir::Identifier>(label, Allocator());
+    ES2PANDA_ASSERT(identNode != nullptr);
     identNode->SetRange(lexer_->GetToken().Loc());
 
     auto *breakStatement = AllocNode<ir::BreakStatement>(identNode);
+    ES2PANDA_ASSERT(breakStatement != nullptr);
     breakStatement->SetRange({startLoc, lexer_->GetToken().End()});
 
     lexer_->NextToken();
@@ -580,6 +591,7 @@ ir::Statement *ParserImpl::ParseContinueStatement()
     }
 
     auto *identNode = AllocNode<ir::Identifier>(label, Allocator());
+    ES2PANDA_ASSERT(identNode != nullptr);
     identNode->SetRange(lexer_->GetToken().Loc());
 
     auto *continueStatement = AllocNode<ir::ContinueStatement>(identNode);
@@ -662,9 +674,11 @@ ir::FunctionDeclaration *ParserImpl::ParseFunctionDeclaration(bool canBeAnonymou
     if (lexer_->GetToken().Type() != lexer::TokenType::LITERAL_IDENT) {
         if (canBeAnonymous) {
             ir::ScriptFunction *func = ParseFunction(newStatus | ParserStatus::NEED_RETURN_TYPE);
+            ES2PANDA_ASSERT(func != nullptr);
             func->SetStart(startLoc);
 
             auto *funcDecl = AllocNode<ir::FunctionDeclaration>(Allocator(), func, true);
+            ES2PANDA_ASSERT(funcDecl != nullptr);
             funcDecl->SetRange(func->Range());
             return funcDecl;
         }
@@ -684,6 +698,7 @@ ir::FunctionDeclaration *ParserImpl::ParseFunctionDeclaration(bool canBeAnonymou
     func->SetIdent(identNode);
     func->SetStart(startLoc);
     auto *funcDecl = AllocNode<ir::FunctionDeclaration>(Allocator(), func);
+    ES2PANDA_ASSERT(funcDecl != nullptr);
     funcDecl->SetRange(func->Range());
 
     if (func->IsOverload() && lexer_->GetToken().Type() == lexer::TokenType::PUNCTUATOR_SEMI_COLON) {
@@ -1383,6 +1398,7 @@ ir::Statement *ParserImpl::ParseTryStatement()
 
     while (lexer_->GetToken().Type() == lexer::TokenType::KEYW_CATCH) {
         catchClause = ParseCatchClause();
+        ES2PANDA_ASSERT(catchClause != nullptr);
         endLoc = catchClause->End();
         catchClauses.push_back(catchClause);
     }
@@ -1398,6 +1414,7 @@ ir::Statement *ParserImpl::ParseTryStatement()
     ArenaVector<std::pair<compiler::LabelPair, const ir::Statement *>> finalizerInsertions(Allocator()->Adapter());
 
     auto *tryStatement = AllocNode<ir::TryStatement>(body, std::move(catchClauses), finallyClause, finalizerInsertions);
+    ES2PANDA_ASSERT(tryStatement != nullptr);
     tryStatement->SetRange({startLoc, endLoc});
     return tryStatement;
 }
@@ -2001,6 +2018,7 @@ ir::Statement *ParserImpl::ParseImportDeclaration(StatementParsingFlags flags)
         source = ParseFromClause(false);
     }
 
+    ES2PANDA_ASSERT(source != nullptr);
     lexer::SourcePosition endLoc = source->End();
     auto *importDeclaration = AllocNode<ir::ImportDeclaration>(source, std::move(specifiers));
     ES2PANDA_ASSERT(importDeclaration != nullptr);
diff --git a/ets2panda/parser/statementTSParser.cpp b/ets2panda/parser/statementTSParser.cpp
index 4cd60c24dbdc8d586dd6fa076ea8788d47759f75..b0a451bcd38a8e6b9058b610c281183fb618cbb2 100644
--- a/ets2panda/parser/statementTSParser.cpp
+++ b/ets2panda/parser/statementTSParser.cpp
@@ -372,6 +372,7 @@ ir::Statement *TSParser::ParseImportDeclaration([[maybe_unused]] StatementParsin
     ES2PANDA_ASSERT(source != nullptr);
     lexer::SourcePosition endLoc = source->End();
     auto *importDeclaration = AllocNode<ir::ImportDeclaration>(source, std::move(specifiers));
+    ES2PANDA_ASSERT(importDeclaration != nullptr);
     importDeclaration->SetRange({startLoc, endLoc});
 
     ConsumeSemicolon(importDeclaration);
diff --git a/ets2panda/test/ast/compiler/ets/unexpected_switch_statement.ets b/ets2panda/test/ast/compiler/ets/unexpected_switch_statement.ets
new file mode 100644
index 0000000000000000000000000000000000000000..a3d25937233a5b51caf377cba89c5e133e52b5c5
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/unexpected_switch_statement.ets
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+let a = 1
+switch(a) {
+    a":
+        try{
+
+        }
+    }
+
+
+/* @@? 18:5 Error SyntaxError: Unexpected token 'identification literal', expected 'case' or 'default'. */
+/* @@? 18:5 Error SyntaxError: Expected ':', got 'identification literal'. */
+/* @@? 18:6 Error SyntaxError: Newline is not allowed in strings */
+/* @@? 18:6 Error SyntaxError: Unexpected token ':'. */
+/* @@? 18:8 Error SyntaxError: Unexpected token 'try'. */
+/* @@? 18:8 Error SyntaxError: A try statement should contain either finally clause or at least one catch clause. */
diff --git a/ets2panda/test/ast/parser/ets/export_as.ets b/ets2panda/test/ast/parser/ets/export_as.ets
new file mode 100644
index 0000000000000000000000000000000000000000..f2c130fbe82e2eb4dc9f52b8c778f816c0390894
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/export_as.ets
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export /* @@ label1 */as /* @@ label2 */namespace mathLib {}
+
+/* @@@ label1 Error SyntaxError: Universal module definitions are not supported, please use ordinary import/export syntax instead. */
+/* @@@ label1 Error SyntaxError: Unexpected token 'as'. */
+/* @@@ label2 Error SyntaxError: Unexpected token 'namespace'. */
diff --git a/ets2panda/test/ast/parser/ets/import_no_empty_binding_list.ets b/ets2panda/test/ast/parser/ets/import_no_empty_binding_list.ets
new file mode 100644
index 0000000000000000000000000000000000000000..dd2ff3124f685c3e2ecc51514d1e4a27b8f41f38
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/import_no_empty_binding_list.ets
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {/* @@ label1 */} /* @@ label2 */from /* @@ label3 */'module'
+
+/* @@@ label1 Error SyntaxError: Importing for side-effect only is prohibited! Please provide objects to be imported explicitly or use * to import all objects declared in the module! */
+/* @@@ label2 Error TypeError: Unresolved reference from */
+/* @@@ label3 Error SyntaxError: Unexpected token 'module'. */
diff --git a/ets2panda/test/ast/parser/ets/import_no_side_effect.ets b/ets2panda/test/ast/parser/ets/import_no_side_effect.ets
new file mode 100644
index 0000000000000000000000000000000000000000..cd4d80cab0b0de58957e3a3cec521d46be29cc37
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/import_no_side_effect.ets
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import /* @@ label1 */'module'
+
+/* @@@ label1 Error SyntaxError: Importing for side-effect only is prohibited! Please provide objects to be imported explicitly or use * to import all objects declared in the module! */
diff --git a/ets2panda/test/ast/parser/ets/no_prototype.ets b/ets2panda/test/ast/parser/ets/no_prototype.ets
new file mode 100644
index 0000000000000000000000000000000000000000..2f70cb7112e9d176b0c326e6865da24e13facf2e
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/no_prototype.ets
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+class C {}
+
+C.prototype = Object.prototype
+
+C.prototype = {
+  m() {
+    console.log("C.m()")
+  }
+}
+
+/* @@? 18:3 Error TypeError: Property 'prototype' does not exist on type 'C' */
+/* @@? 18:13 Error SyntaxError: Runtime prototype assignment is not supported because of static typing */
+/* @@? 18:22 Error TypeError: Property 'prototype' does not exist on type 'Object' */
+/* @@? 20:1 Error SyntaxError: Runtime prototype assignment is not supported because of static typing */
+/* @@? 20:3 Error TypeError: Property 'prototype' does not exist on type 'C' */
+/* @@? 20:13 Error SyntaxError: Runtime prototype assignment is not supported because of static typing */
+/* @@? 21:4 Error SyntaxError: Unexpected token, expected ':'. */
+/* @@? 21:5 Error SyntaxError: Unexpected token ')'. */
+/* @@? 21:7 Error SyntaxError: Unexpected token. */
+/* @@? 22:12 Error SyntaxError: Unexpected token, expected ':'. */
+/* @@? 24:1 Error SyntaxError: Unexpected token '}'. */
diff --git a/ets2panda/test/runtime/ets/defaultExportObjectLiteral_exp.ets b/ets2panda/test/runtime/ets/defaultExportObjectLiteral_exp.ets
new file mode 100644
index 0000000000000000000000000000000000000000..885d31856d248e4b5846195e93be02b324b5ad0f
--- /dev/null
+++ b/ets2panda/test/runtime/ets/defaultExportObjectLiteral_exp.ets
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+interface User {
+  name: string;
+  age: number;
+  email: string;
+};
+
+export default {
+  name:  'John Doe',
+  age: 30,
+  email: 'johndoe@example.com'
+} as User;
diff --git a/ets2panda/test/runtime/ets/too_many_async.ets b/ets2panda/test/runtime/ets/too_many_async.ets
new file mode 100644
index 0000000000000000000000000000000000000000..066837c21e997b9c7355b2f7d3ca03ce4f58766b
--- /dev/null
+++ b/ets2panda/test/runtime/ets/too_many_async.ets
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*---
+    tags: [compile-only, negative]
+---*/
+
+// This test cannot moved to astchecker, because this will lead python JSON parse error: 
+// Failed with maximum recursion depth exceeded while decoding a JSON object from a unicode string
+
+async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(async(a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diff --git a/ets2panda/test/runtime/ets/too_many_await.ets b/ets2panda/test/runtime/ets/too_many_await.ets
new file mode 100644
index 0000000000000000000000000000000000000000..94fe79227451711cf20bcd711333d768aef21441
--- /dev/null
+++ b/ets2panda/test/runtime/ets/too_many_await.ets
@@ -0,0 +1,22 @@
+/* 
+ * Copyright (c) 2025 Huawei Device Co., Ltd. 
+ * Licensed under the Apache License, Version 2.0 (the "License"); 
+ * you may not use this file except in compliance with the License. 
+ * You may obtain a copy of the License at 
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0 
+ * 
+ * Unless required by applicable law or agreed to in writing, software 
+ * distributed under the License is distributed on an "AS IS" BASIS, 
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+ * See the License for the specific language governing permissions and 
+ * limitations under the License. 
+ */
+/*---
+    tags: [compile-only, negative]
+---*/
+
+// This test cannot moved to astchecker, because this will lead python JSON parse error: 
+// Failed with maximum recursion depth exceeded while decoding a JSON object from a unicode string
+
+await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await 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await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await await 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diff --git a/ets2panda/test/runtime/ets/too_many_left_brace.ets b/ets2panda/test/runtime/ets/too_many_left_brace.ets
new file mode 100644
index 0000000000000000000000000000000000000000..aab155383ecad39002ebdd5ff0495016be019d1a
--- /dev/null
+++ b/ets2panda/test/runtime/ets/too_many_left_brace.ets
@@ -0,0 +1,22 @@
+/* 
+ * Copyright (c) 2025 Huawei Device Co., Ltd. 
+ * Licensed under the Apache License, Version 2.0 (the "License"); 
+ * you may not use this file except in compliance with the License. 
+ * You may obtain a copy of the License at 
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0 
+ * 
+ * Unless required by applicable law or agreed to in writing, software 
+ * distributed under the License is distributed on an "AS IS" BASIS, 
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+ * See the License for the specific language governing permissions and 
+ * limitations under the License. 
+ */ 
+/*---
+    tags: [compile-only, negative]
+---*/
+
+// This test cannot moved to astchecker, because this will lead python JSON parse error: 
+// Failed with maximum recursion depth exceeded while decoding a JSON object from a unicode string
+
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diff --git a/ets2panda/test/runtime/ets/too_many_left_square_brackets.ets b/ets2panda/test/runtime/ets/too_many_left_square_brackets.ets
new file mode 100644
index 0000000000000000000000000000000000000000..07d66a05d57ac071e446835400ee9b3dd356b07b
--- /dev/null
+++ b/ets2panda/test/runtime/ets/too_many_left_square_brackets.ets
@@ -0,0 +1,21 @@
+/* 
+ * Copyright (c) 2025 Huawei Device Co., Ltd. 
+ * Licensed under the Apache License, Version 2.0 (the "License"); 
+ * you may not use this file except in compliance with the License. 
+ * You may obtain a copy of the License at 
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0 
+ * 
+ * Unless required by applicable law or agreed to in writing, software 
+ * distributed under the License is distributed on an "AS IS" BASIS, 
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+ * See the License for the specific language governing permissions and 
+ * limitations under the License. 
+ */ 
+/*---
+    tags: [compile-only, negative]
+---*/
+
+// This test cannot moved to astchecker, because this will lead python JSON parse error: 
+// Failed with maximum recursion depth exceeded while decoding a JSON object from a unicode string
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