9c4a716c12
This patch improves the preservation of qualifiers and loss of type sugar in TemplateNames. This problem is analogous to https://reviews.llvm.org/D112374 and this patch takes a very similar approach to that patch, except the impact here is much lesser. When a TemplateName was written bare, without qualifications, we wouldn't produce a QualifiedTemplate which could be used to disambiguate it from a Canonical TemplateName. This had effects in the TemplateName printer, which had workarounds to deal with this, and wouldn't print the TemplateName as-written in most situations. There are also some related fixes to help preserve this type sugar along the way into diagnostics, so that this patch can be properly tested. - Fix dropping the template keyword. - Fix type deduction to preserve sugar in TST TemplateNames.
45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
// RUN: %clang_cc1 -std=c++20 -verify -fsyntax-only %s
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namespace a {
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template <typename T>
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concept C1 = true; // #C1
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template <typename T>
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auto V1 = true; // #V1
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namespace b {
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template <typename T>
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concept C2 = true; // #C2
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template <typename T>
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auto V2 = true; // #V2
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}
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}
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template <typename T>
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concept C3 = true; // #C3
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template <typename T>
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auto V3 = true; // #V3
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template <template <typename T> typename C>
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constexpr bool test = true;
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static_assert(test<a::C1>); // expected-error {{too few template arguments for concept 'C1'}} \
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// expected-note@#C1 {{here}}
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static_assert(test<a::b::C2>); // expected-error {{too few template arguments for concept 'C2'}} \
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// expected-note@#C2 {{here}}
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static_assert(test<C3>); // expected-error {{too few template arguments for concept 'C3'}} \
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// expected-note@#C3 {{here}}
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static_assert(test<a::V1>); // expected-error {{use of variable template 'a::V1' requires template arguments}} \
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// expected-note@#V1 {{here}}
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static_assert(test<a::b::V2>); // expected-error {{use of variable template 'a::b::V2' requires template arguments}} \
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// expected-note@#V2 {{here}}
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static_assert(test<V3>); // expected-error {{use of variable template 'V3' requires template arguments}} \
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// expected-note@#V3 {{here}}
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void f() {
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C3 t1 = 0; // expected-error {{expected 'auto' or 'decltype(auto)' after concept name}}
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a::C1 t2 = 0; // expected-error {{expected 'auto' or 'decltype(auto)' after concept name}}
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a::b::C2 t3 = 0; // expected-error {{expected 'auto' or 'decltype(auto)' after concept name}}
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}
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