aee4925507
Based on post-commit review discussion on2bd8493847with Richard Smith. Other uses of forcing HasEmptyPlaceHolder to false seem OK to me - they're all around pointer/reference types where the pointer/reference token will appear at the rightmost side of the left side of the type name, so they make nested types (eg: the "int" in "int *") behave as though there is a non-empty placeholder (because the "*" is essentially the placeholder as far as the "int" is concerned). This was originally committed in277623f4d5Reverted inf9ad1d1c77due to breakages outside of clang - lldb seems to have some strange/strong dependence on "char [N]" versus "char[N]" when printing strings (not due to that name appearing in DWARF, but probably due to using clang to stringify type names) that'll need to be addressed, plus a few other odds and ends in other subprojects (clang-tools-extra, compiler-rt, etc).
23 lines
1.2 KiB
C++
23 lines
1.2 KiB
C++
// RUN: %clang_cc1 -std=c++2a -x c++ -verify %s
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template<typename T, typename S = char> requires (sizeof(T) + sizeof(S) < 10)
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// expected-note@-1{{because 'sizeof(char[100]) + sizeof(char) < 10' (101 < 10) evaluated to false}}
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void f(T t, S s) requires (sizeof(t) == 1 && sizeof(s) == 1) { };
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// expected-note@-1{{candidate template ignored: constraints not satisfied [with T = int, S = char]}}
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// expected-note@-2{{because 'sizeof (t) == 1' (4 == 1) evaluated to false}}
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// expected-note@-3{{candidate template ignored: constraints not satisfied [with T = char, S = short]}}
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// expected-note@-4{{because 'sizeof (s) == 1' (2 == 1) evaluated to false}}
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// expected-note@-5{{candidate template ignored: constraints not satisfied [with T = char[100], S = char]}}
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template<>
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void f<int>(int t, char s) { };
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// expected-error@-1{{no function template matches function template specialization 'f'}}
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template<>
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void f<char, short>(char t, short s) { };
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// expected-error@-1{{no function template matches function template specialization 'f'}}
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template<>
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void f<char[100]>(char t[100], char s) { };
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// expected-error@-1{{no function template matches function template specialization 'f'}}
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