d182877ba3
In the clang AST, constraint nodes are deliberately not instantiated unless they are actively being evaluated. Consequently, occurrences of template parameters in the require-clause expression have a subtle "depth" difference compared to normal occurrences in places, such as function parameters. When transforming the require-clause, we must take this distinction into account. The existing implementation overlooks this consideration. This patch is to rewrite the implementation of the require-clause transformation to address this issue. Fixes #90177
41 lines
1.7 KiB
C++
41 lines
1.7 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -std=c++2a -ast-dump %s | FileCheck -strict-whitespace %s
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template <typename, typename>
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constexpr bool Concept = true;
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template<typename T> // depth 0
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struct Out {
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template<typename U> // depth 1
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struct Inner {
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U t;
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};
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template<typename V> // depth1
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requires Concept<T, V>
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Inner(V) -> Inner<V>;
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};
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template <typename X>
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struct Out2 {
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template<typename Y> // depth1
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using AInner = Out<int>::Inner<Y>;
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};
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Out2<double>::AInner t(1.0);
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// Verify that the require-clause of alias deduction guide is transformed correctly:
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// - Occurrence T should be replaced with `int`;
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// - Occurrence V should be replaced with the Y with depth 1
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//
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// CHECK: | `-FunctionTemplateDecl {{.*}} <deduction guide for AInner>
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// CHECK-NEXT: | |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 Y
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// CHECK-NEXT: | |-UnresolvedLookupExpr {{.*}} '<dependent type>' lvalue (no ADL) = 'Concept'
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// CHECK-NEXT: | | |-TemplateArgument type 'int'
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// CHECK-NEXT: | | | `-BuiltinType {{.*}} 'int'
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// CHECK-NEXT: | | `-TemplateArgument type 'type-parameter-1-0'
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// CHECK-NEXT: | | `-TemplateTypeParmType {{.*}} 'type-parameter-1-0' dependent depth 1 index 0
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// CHECK-NEXT: | |-CXXDeductionGuideDecl {{.*}} <deduction guide for AInner> 'auto (type-parameter-0-0) -> Inner<type-parameter-0-0>'
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// CHECK-NEXT: | | `-ParmVarDecl {{.*}} 'type-parameter-0-0'
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// CHECK-NEXT: | `-CXXDeductionGuideDecl {{.*}} used <deduction guide for AInner> 'auto (double) -> Inner<double>' implicit_instantiation
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// CHECK-NEXT: | |-TemplateArgument type 'double'
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// CHECK-NEXT: | | `-BuiltinType {{.*}} 'double'
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// CHECK-NEXT: | `-ParmVarDecl {{.*}} 'double'
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