1da3119025
Looks like we again are going to have problems with libcxx tests that are overly specific in their dependency on clang's diagnostics. This reverts commit 6542cb55a3eb115b1c3592514590a19987ffc498.
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++14 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++20 -verify=cxx20 %s
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// expected-no-diagnostics
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struct Incomplete;
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template <class T> struct Holder { T t; };
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namespace DotFollowingFunctionName {
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struct Good {
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struct Nested {
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int b;
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} a;
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};
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struct Bad {
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Holder<Incomplete> a();
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};
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template <class T>
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constexpr auto f(T t) -> decltype((t.a.b, true)) { return true; }
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constexpr bool f(...) { return false; }
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static_assert(DotFollowingFunctionName::f(Good{}), "");
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static_assert(!DotFollowingFunctionName::f(Bad{}), "");
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#if __cplusplus >= 202002L
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template <class T>
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concept C = requires(T t) { t.a.b; };
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// cxx20-note@-1 {{because 't.a.b' would be invalid: reference to non-static member function must be called}}
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static_assert(C<Good>);
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static_assert(!C<Bad>);
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static_assert(C<Bad>); // cxx20-error {{static_assert failed}}
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// cxx20-note@-1 {{because 'DotFollowingFunctionName::Bad' does not satisfy 'C'}}
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#endif
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} // namespace DotFollowingFunctionName
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namespace DotFollowingPointer {
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struct Good {
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int begin();
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};
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using Bad = Holder<Incomplete> *;
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template <class T>
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constexpr auto f(T t) -> decltype((t.begin(), true)) { return true; }
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constexpr bool f(...) { return false; }
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static_assert(DotFollowingPointer::f(Good{}), "");
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static_assert(!DotFollowingPointer::f(Bad{}), "");
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#if __cplusplus >= 202002L
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template <class T>
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concept C = requires(T t) { t.begin(); };
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// cxx20-note@-1 {{because 't.begin()' would be invalid: member reference type 'Holder<Incomplete> *' is a pointer}}
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static_assert(C<Good>);
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static_assert(!C<Bad>);
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static_assert(C<Bad>); // cxx20-error {{static_assert failed}}
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// cxx20-note@-1 {{because 'DotFollowingPointer::Bad' (aka 'Holder<Incomplete> *') does not satisfy 'C'}}
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#endif
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} // namespace DotFollowingPointer
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