From 9609265e8a66cc6464c5e5eada2246905c460c83 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ferenc=20Horv=C3=A1th?= Date: Tue, 7 Nov 2023 13:43:37 +0100 Subject: [PATCH] Fix the checking of generic types with nullable type params MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fixes internal issue #13648 Issue: https://gitee.com/openharmony/arkcompiler_ets_frontend/issues/I8IP7N Testing: All required pre-merge tests passed. Results are available in the ggwatcher. Signed-off-by: Ferenc Horváth Change-Id: Icb924b908a762b539e7f5eb9f41c84942ea88714 --- ets2panda/checker/ets/helpers.cpp | 8 + ets2panda/checker/types/ets/etsObjectType.cpp | 6 + ...ullableTypeParamToNonNullable-expected.txt | 1015 +++++++++++++ ...ericWithNullableTypeParamToNonNullable.ets | 22 + .../ets/nullableGenericSignature-expected.txt | 1318 +++++++++++++++++ .../parser/ets/nullableGenericSignature.ets | 30 + 6 files changed, 2399 insertions(+) create mode 100644 ets2panda/test/compiler/ets/n_assignGenericWithNullableTypeParamToNonNullable-expected.txt create mode 100644 ets2panda/test/compiler/ets/n_assignGenericWithNullableTypeParamToNonNullable.ets create mode 100644 ets2panda/test/parser/ets/nullableGenericSignature-expected.txt create mode 100644 ets2panda/test/parser/ets/nullableGenericSignature.ets diff --git a/ets2panda/checker/ets/helpers.cpp b/ets2panda/checker/ets/helpers.cpp index 1f6e386a21..91147cb947 100644 --- a/ets2panda/checker/ets/helpers.cpp +++ b/ets2panda/checker/ets/helpers.cpp @@ -2084,6 +2084,14 @@ static void TypeToString(std::stringstream &ss, Type *tp) } ss << ">"; } + + if (tp->ContainsNull()) { + ss << "|null"; + } + + if (tp->ContainsUndefined()) { + ss << "|undefined"; + } } util::StringView ETSChecker::GetHashFromTypeArguments(const ArenaVector &type_arg_types) diff --git a/ets2panda/checker/types/ets/etsObjectType.cpp b/ets2panda/checker/types/ets/etsObjectType.cpp index 6c6435e7ec..289fa2e92a 100644 --- a/ets2panda/checker/types/ets/etsObjectType.cpp +++ b/ets2panda/checker/types/ets/etsObjectType.cpp @@ -349,6 +349,12 @@ void ETSObjectType::IdenticalUptoNullability(TypeRelation *relation, Type *other continue; } + // checking the nullishness of type args before getting their original base types + // because most probably GetOriginalBaseType will return the non-nullish version of the type + if (!type_arguments_[idx]->IsNullish() && other_type_arguments[idx]->IsNullish()) { + return; + } + const auto get_original_base_type_or_type = [&relation](Type *const original_type) { auto *const base_type = relation->GetChecker()->AsETSChecker()->GetOriginalBaseType(original_type); return base_type == nullptr ? original_type : base_type; diff --git a/ets2panda/test/compiler/ets/n_assignGenericWithNullableTypeParamToNonNullable-expected.txt b/ets2panda/test/compiler/ets/n_assignGenericWithNullableTypeParamToNonNullable-expected.txt new file mode 100644 index 0000000000..a2cc17f306 --- /dev/null +++ b/ets2panda/test/compiler/ets/n_assignGenericWithNullableTypeParamToNonNullable-expected.txt @@ -0,0 +1,1015 @@ +{ + "type": "Program", + "statements": [ + { + "type": "ClassDeclaration", + "definition": { + "id": { + "type": "Identifier", + "name": "A", + "decorators": [], + "loc": { + "start": { + "line": 16, + "column": 7 + }, + "end": { + "line": 16, + "column": 8 + } + } + }, + "typeParameters": { + "type": "TSTypeParameterDeclaration", + "params": [ + { + "type": "TSTypeParameter", + "name": { + "type": "Identifier", + "name": "T", + "decorators": [], + "loc": { + "start": { + "line": 16, + "column": 9 + }, + "end": { + "line": 16, + "column": 10 + } + } + }, + "loc": { + "start": { + "line": 16, + "column": 9 + }, + "end": { + "line": 16, + "column": 11 + } + } + } + ], + "loc": { + "start": { + "line": 16, + "column": 8 + }, + "end": { + "line": 16, + "column": 11 + } + } + }, + "superClass": null, + "implements": [], + "body": [ + { + "type": "MethodDefinition", + "key": { + "type": "Identifier", + "name": "constructor", + "decorators": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "kind": "constructor", + "static": false, + "optional": false, + "computed": false, + "value": { + "type": "FunctionExpression", + "function": { + "type": "ScriptFunction", + "id": { + "type": "Identifier", + "name": "constructor", + "decorators": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "generator": false, + "async": false, + "expression": false, + "params": [], + "body": { + "type": "BlockStatement", + "statements": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "overloads": [], + "decorators": [], + "loc": { + "start": { + "line": 16, + "column": 14 + }, + "end": { + "line": 16, + "column": 14 + } + } + } + ], + "loc": { + "start": { + "line": 16, + "column": 12 + }, + "end": { + "line": 16, + "column": 14 + } + } + }, + "loc": { + "start": { + "line": 16, + "column": 1 + }, + "end": { + "line": 16, + "column": 14 + } + } + }, + { + "type": "ClassDeclaration", + "definition": { + "id": { + "type": "Identifier", + "name": "B", + "decorators": [], + "loc": { + "start": { + "line": 17, + "column": 7 + }, + "end": { + "line": 17, + "column": 8 + } + } + }, + "superClass": null, + "implements": [], + "body": [ + { + "type": "MethodDefinition", + "key": { + "type": "Identifier", + "name": "constructor", + "decorators": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "kind": "constructor", + "static": false, + "optional": false, + "computed": false, + "value": { + "type": "FunctionExpression", + "function": { + "type": "ScriptFunction", + "id": { + "type": "Identifier", + "name": "constructor", + "decorators": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "generator": false, + "async": false, + "expression": false, + "params": [], + "body": { + "type": "BlockStatement", + "statements": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "overloads": [], + "decorators": [], + "loc": { + "start": { + "line": 17, + "column": 11 + }, + "end": { + "line": 17, + "column": 11 + } + } + } + ], + "loc": { + "start": { + "line": 17, + "column": 9 + }, + "end": { + "line": 17, + "column": 11 + } + } + }, + "loc": { + "start": { + "line": 17, + "column": 1 + }, + "end": { + "line": 17, + "column": 11 + } + } + }, + { + "type": "ClassDeclaration", + "definition": { + "id": { + "type": "Identifier", + "name": "ETSGLOBAL", + "decorators": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "superClass": null, + "implements": [], + "body": [ + { + "type": "MethodDefinition", + "key": { + "type": "Identifier", + "name": "_$init$_", + "decorators": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "kind": "method", + "accessibility": "public", + "static": true, + "optional": false, + "computed": false, + "value": { + "type": "FunctionExpression", + "function": { + "type": "ScriptFunction", + "id": { + "type": "Identifier", + "name": "_$init$_", + "decorators": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "generator": false, + "async": false, + "expression": false, + "params": [], + "body": { + "type": "BlockStatement", + "statements": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "overloads": [], + "decorators": [], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + { + "type": "MethodDefinition", + "key": { + "type": "Identifier", + "name": "main", + "decorators": [], + "loc": { + "start": { + "line": 19, + "column": 10 + }, + "end": { + "line": 19, + "column": 14 + } + } + }, + "kind": "method", + "accessibility": "public", + "static": true, + "optional": false, + "computed": false, + "value": { + "type": "FunctionExpression", + "function": { + "type": "ScriptFunction", + "id": { + "type": "Identifier", + "name": "main", + "decorators": [], + "loc": { + "start": { + "line": 19, + "column": 10 + }, + "end": { + "line": 19, + "column": 14 + } + } + }, + "generator": false, + "async": false, + "expression": false, + "params": [], + "returnType": { + "type": "ETSTypeReference", + "part": { + "type": "ETSTypeReferencePart", + "name": { + "type": "Identifier", + "name": "void", + "decorators": [], + "loc": { + "start": { + "line": 19, + "column": 18 + }, + "end": { + "line": 19, + "column": 22 + } + } + }, + "loc": { + "start": { + "line": 19, + "column": 18 + }, + "end": { + "line": 19, + "column": 24 + } + } + }, + "loc": { + "start": { + "line": 19, + "column": 18 + }, + "end": { + "line": 19, + "column": 24 + } + } + }, + "body": { + "type": "BlockStatement", + "statements": [ + { + "type": "VariableDeclaration", + "declarations": [ + { + "type": "VariableDeclarator", + "id": { + "type": "Identifier", + "name": "abn", + "typeAnnotation": { + "type": "ETSTypeReference", + "part": { + "type": "ETSTypeReferencePart", + "name": { + "type": "Identifier", + "name": "A", + "decorators": [], + "loc": { + "start": { + "line": 20, + "column": 13 + }, + "end": { + "line": 20, + "column": 14 + } + } + }, + "typeParams": { + "type": "TSTypeParameterInstantiation", + "params": [ + { + "type": "ETSTypeReference", + "part": { + "type": "ETSTypeReferencePart", + "name": { + "type": "Identifier", + "name": "B", + "decorators": [], + "loc": { + "start": { + "line": 20, + "column": 15 + }, + "end": { + "line": 20, + "column": 16 + } + } + }, + "loc": { + "start": { + "line": 20, + "column": 15 + }, + "end": { + "line": 20, + "column": 18 + } + } + }, + "loc": { + "start": { + "line": 20, + "column": 15 + }, + "end": { + "line": 20, + "column": 18 + } + } + } + ], + "loc": { + "start": { + "line": 20, + "column": 14 + }, + "end": { + "line": 20, + "column": 24 + } + } + }, + "loc": { + "start": { + "line": 20, + "column": 13 + }, + "end": { + "line": 20, + "column": 26 + } + } + }, + "loc": { + "start": { + "line": 20, + "column": 13 + }, + "end": { + "line": 20, + "column": 26 + } + } + }, + "decorators": [], + "loc": { + "start": { + "line": 20, + "column": 7 + }, + "end": { + "line": 20, + "column": 10 + } + } + }, + "init": { + "type": "ETSNewClassInstanceExpression", + "typeReference": { + "type": "ETSTypeReference", + "part": { + "type": "ETSTypeReferencePart", + "name": { + "type": "Identifier", + "name": "A", + "decorators": [], + "loc": { + "start": { + "line": 20, + "column": 31 + }, + "end": { + "line": 20, + "column": 32 + } + } + }, + "typeParams": { + "type": "TSTypeParameterInstantiation", + "params": [ + { + "type": "ETSTypeReference", + "part": { + "type": "ETSTypeReferencePart", + "name": { + "type": "Identifier", + "name": "B", + "decorators": [], + "loc": { + "start": { + "line": 20, + "column": 33 + }, + "end": { + "line": 20, + "column": 34 + } + } + }, + "loc": { + "start": { + "line": 20, + "column": 33 + }, + "end": { + "line": 20, + "column": 35 + } + } + }, + "loc": { + "start": { + "line": 20, + "column": 33 + }, + "end": { + "line": 20, + "column": 35 + } + } + } + ], + "loc": { + "start": { + "line": 20, + "column": 32 + }, + "end": { + "line": 20, + "column": 35 + } + } + }, + "loc": { + "start": { + "line": 20, + "column": 31 + }, + "end": { + "line": 20, + "column": 36 + } + } + }, + "loc": { + "start": { + "line": 20, + "column": 31 + }, + "end": { + "line": 20, + "column": 36 + } + } + }, + "arguments": [], + "loc": { + "start": { + "line": 20, + "column": 27 + }, + "end": { + "line": 20, + "column": 38 + } + } + }, + "loc": { + "start": { + "line": 20, + "column": 7 + }, + "end": { + "line": 20, + "column": 38 + } + } + } + ], + "kind": "let", + "loc": { + "start": { + "line": 20, + "column": 3 + }, + "end": { + "line": 20, + "column": 38 + } + } + }, + { + "type": "VariableDeclaration", + "declarations": [ + { + "type": "VariableDeclarator", + "id": { + "type": "Identifier", + "name": "ab", + "typeAnnotation": { + "type": "ETSTypeReference", + "part": { + "type": "ETSTypeReferencePart", + "name": { + "type": "Identifier", + "name": "A", + "decorators": [], + "loc": { + "start": { + "line": 21, + "column": 12 + }, + "end": { + "line": 21, + "column": 13 + } + } + }, + "typeParams": { + "type": "TSTypeParameterInstantiation", + "params": [ + { + "type": "ETSTypeReference", + "part": { + "type": "ETSTypeReferencePart", + "name": { + "type": "Identifier", + "name": "B", + "decorators": [], + "loc": { + "start": { + "line": 21, + "column": 14 + }, + "end": { + "line": 21, + "column": 15 + } + } + }, + "loc": { + "start": { + "line": 21, + "column": 14 + }, + "end": { + "line": 21, + "column": 16 + } + } + }, + "loc": { + "start": { + "line": 21, + "column": 14 + }, + "end": { + "line": 21, + "column": 16 + } + } + } + ], + "loc": { + "start": { + "line": 21, + "column": 13 + }, + "end": { + "line": 21, + "column": 16 + } + } + }, + "loc": { + "start": { + "line": 21, + "column": 12 + }, + "end": { + "line": 21, + "column": 18 + } + } + }, + "loc": { + "start": { + "line": 21, + "column": 12 + }, + "end": { + "line": 21, + "column": 18 + } + } + }, + "decorators": [], + "loc": { + "start": { + "line": 21, + "column": 7 + }, + "end": { + "line": 21, + "column": 9 + } + } + }, + "init": { + "type": "Identifier", + "name": "abn", + "decorators": [], + "loc": { + "start": { + "line": 21, + "column": 19 + }, + "end": { + "line": 21, + "column": 22 + } + } + }, + "loc": { + "start": { + "line": 21, + "column": 7 + }, + "end": { + "line": 21, + "column": 22 + } + } + } + ], + "kind": "let", + "loc": { + "start": { + "line": 21, + "column": 3 + }, + "end": { + "line": 21, + "column": 23 + } + } + } + ], + "loc": { + "start": { + "line": 19, + "column": 23 + }, + "end": { + "line": 22, + "column": 2 + } + } + }, + "loc": { + "start": { + "line": 19, + "column": 14 + }, + "end": { + "line": 22, + "column": 2 + } + } + }, + "loc": { + "start": { + "line": 19, + "column": 14 + }, + "end": { + "line": 22, + "column": 2 + } + } + }, + "overloads": [], + "decorators": [], + "loc": { + "start": { + "line": 19, + "column": 1 + }, + "end": { + "line": 22, + "column": 2 + } + } + } + ], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + }, + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 1, + "column": 1 + } + } + } + ], + "loc": { + "start": { + "line": 1, + "column": 1 + }, + "end": { + "line": 23, + "column": 1 + } + } +} +TypeError: Initializers type is not assignable to the target type [n_assignGenericWithNullableTypeParamToNonNullable.ets:21:19] diff --git a/ets2panda/test/compiler/ets/n_assignGenericWithNullableTypeParamToNonNullable.ets b/ets2panda/test/compiler/ets/n_assignGenericWithNullableTypeParamToNonNullable.ets new file mode 100644 index 0000000000..8dab208be0 --- /dev/null +++ b/ets2panda/test/compiler/ets/n_assignGenericWithNullableTypeParamToNonNullable.ets @@ -0,0 +1,22 @@ +/* + * Copyright (c) 2023 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 A {} +class B {} + +function main(): void { + let abn : A = new A(); // should work: non nullable B is the subtype of nullable B + let ab : A = abn; // should not work: nullable B (the type of abn) is not the subtype of non nullable B +} diff --git a/ets2panda/test/parser/ets/nullableGenericSignature-expected.txt b/ets2panda/test/parser/ets/nullableGenericSignature-expected.txt new file mode 100644 index 0000000000..d9bf80ff97 --- /dev/null +++ b/ets2panda/test/parser/ets/nullableGenericSignature-expected.txt @@ -0,0 +1,1318 @@ +{ + "type": "Program", + "statements": [ + { + "type": "ClassDeclaration", + "definition": { + "id": { + "type": "Identifier", + "name": "Arr", + "decorators": [], + "loc": { + "start": { + "line": 16, + "column": 7 + }, + "end": { + "line": 16, + "column": 10 + } + } + }, + "typeParameters": { + "type": "TSTypeParameterDeclaration", + "params": [ + { + "type": "TSTypeParameter", + "name": { + "type": "Identifier", + "name": "T", + "decorators": [], + "loc": { + "start": { + "line": 16, + "column": 11 + }, + "end": { + "line": 16, + "column": 12 + } + } + }, + "loc": { + "start": { + "line": 16, + "column": 11 + }, + "end": { + "line": 16, + "column": 13 + } + } + } + ], + "loc": { + "start": { + "line": 16, + "column": 10 + }, + "end": { + "line": 16, + "column": 13 + } + } + }, + "superClass": null, + "implements": [], + "body": [ + { + "type": "MethodDefinition", + "key": { + "type": "Identifier", + "name": "every", + "decorators": [], + "loc": { + "start": { + "line": 17, + "column": 3 + }, + "end": { + "line": 17, + "column": 8 + } + } + }, + "kind": "method", + "accessibility": "public", + "static": false, + "optional": false, + "computed": false, + "value": { + "type": "FunctionExpression", + "function": { + "type": "ScriptFunction", + "id": { + "type": "Identifier", + "name": "every", + "decorators": [], + "loc": { + "start": { + "line": 17, + "column": 3 + }, + "end": { + "line": 17, + "column": 8 + } + } + }, + "generator": false, + "async": false, + "expression": false, + "params": [ + { + "type": "ETSParameterExpression", + "name": { + "type": "Identifier", + "name": "fn", + "typeAnnotation": { + "type": "ETSFunctionType", + "params": [ + { + "type": "ETSParameterExpression", + "name": { + "type": "Identifier", + "name": "v", + "typeAnnotation": { + "type": "ETSTypeReference", + "part": { + "type": "ETSTypeReferencePart", + "name": { + "type": "Identifier", + "name": "T", + "decorators": [], + "loc": { + "start": { + "line": 17, + "column": 17 + }, + "end": { + "line": 17, + "column": 18 + } + } + }, + "loc": { + "start": { + "line": 17, + "column": 17 + }, + "end": { + "line": 17, + "column": 19 + } + } + }, + "loc": { + "start": { + "line": 17, + "column": 17 + }, + "end": { + "line": 17, + "column": 19 + } + } + }, + "decorators": [], + "loc": { + "start": { + "line": 17, + "column": 14 + }, + "end": { + "line": 17, + "column": 19 + } + } + }, + "loc": { + "start": { + "line": 17, + "column": 14 + }, + "end": { + "line": 17, + "column": 19 + } + } + } + ], + "returnType": { + "type": "ETSPrimitiveType", + "loc": { + "start": { + "line": 17, + "column": 23 + }, + "end": { + "line": 17, + "column": 30 + } + } + }, + "loc": { + "start": { + "line": 17, + "column": 13 + }, + "end": { + "line": 17, + "column": 30 + } + } + }, + "decorators": [], + "loc": { + "start": { + "line": 17, + "column": 9 + }, + "end": { + "line": 17, + "column": 30 + } + } + }, + "loc": { + "start": { + "line": 17, + "column": 9 + }, + "end": { + "line": 17, + "column": 30 + } + } + } + ], + "returnType": { + "type": "ETSPrimitiveType", + "loc": { + "start": { + "line": 17, + "column": 33 + }, + "end": { + "line": 17, + "column": 40 + } + } + }, + "body": { + "type": "BlockStatement", + "statements": [ + { + "type": "ReturnStatement", + "argument": { + "type": "BooleanLiteral", + "value": true, + "loc": { + "start": { + "line": 18, + "column": 12 + }, + "end": { + "line": 18, + "column": 16 + } + } + }, + "loc": { + "start": { + "line": 18, + "column": 5 + }, + "end": { + "line": 18, + "column": 17 + } + } + } + ], + "loc": { + "start": { + "line": 17, + "column": 41 + }, + "end": { + "line": 19, + "column": 4 + } + } + }, + "loc": { + "start": { + "line": 17, + "column": 8 + }, + "end": { + "line": 19, + "column": 4 + } + } + }, + "loc": { + "start": { + "line": 17, + "column": 8 + }, + "end": { + "line": 19, + "column": 4 + } + } + }, + "overloads": [], + "decorators": [], + "loc": { + "start": { + "line": 17, + "column": 3 + }, + "end": { + "line": 19, + "column": 4 + } + } + }, + { + "type": "MethodDefinition", + "key": { + "type": "Identifier", + "name": "flat", + "decorators": [], + "loc": { + "start": { + "line": 21, + "column": 3 + }, + "end": { + "line": 21, + "column": 7 + } + } + }, + "kind": "method", + "accessibility": 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a/ets2panda/test/parser/ets/nullableGenericSignature.ets b/ets2panda/test/parser/ets/nullableGenericSignature.ets new file mode 100644 index 0000000000..a17c97b967 --- /dev/null +++ b/ets2panda/test/parser/ets/nullableGenericSignature.ets @@ -0,0 +1,30 @@ +/* + * Copyright (c) 2023 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 Arr { + every(fn: (v: T) => boolean): boolean { + return true; + } + + flat(): Arr { + throw new Error(); + } +} + +function test(x: Arr): boolean { + return x.every((item: Object): boolean => { + return true; + }) +} -- Gitee