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[C++20] [Modules] Emit implicit Deduction Guide for implicit class sp…
…ecialization Fixed a crash for the attached test case due to we missed to emit the deduction guide. The reason is, the deduction guide is attached to the export-decl in the imported module. So we won't emit it by traversing the AST of the current TU.
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// RUN: rm -rf %t | ||
// RUN: mkdir -p %t | ||
// RUN: split-file %s %t | ||
// | ||
// RUN: %clang_cc1 -std=c++20 %t/invocable.cppm -emit-module-interface -o %t/invocable.pcm | ||
// RUN: %clang_cc1 -std=c++20 %t/lambda.cppm -emit-module-interface -o %t/lambda.pcm -fprebuilt-module-path=%t | ||
// RUN: %clang_cc1 -std=c++20 %t/test.cc -fprebuilt-module-path=%t -fsyntax-only -verify | ||
// | ||
// RUN: %clang_cc1 -std=c++20 %t/invocable.cppm -emit-reduced-module-interface -o %t/invocable.pcm | ||
// RUN: %clang_cc1 -std=c++20 %t/lambda.cppm -emit-reduced-module-interface -o %t/lambda.pcm -fprebuilt-module-path=%t | ||
// RUN: %clang_cc1 -std=c++20 %t/test.cc -fprebuilt-module-path=%t -fsyntax-only -verify | ||
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//--- invocable.cppm | ||
export module invocable; | ||
export template <class _Fn, class... _Args> | ||
concept invocable = requires(_Fn&& __fn, _Args&&... __args) { | ||
_Fn(__args...); | ||
}; | ||
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export template <class _Fn, class _Args> | ||
constexpr bool is_callable(_Fn&& __fn, _Args&& __args) { | ||
return invocable<_Fn, _Args>; | ||
} | ||
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export template <class _Fn> | ||
struct Callable : _Fn { | ||
constexpr explicit Callable(_Fn &&__fn) : _Fn(static_cast<_Fn&&>(__fn)) {} | ||
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template <class _Args> | ||
constexpr auto operator()(_Args&& __args) { | ||
return _Fn(__args); | ||
} | ||
}; | ||
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//--- lambda.cppm | ||
export module lambda; | ||
import invocable; | ||
export constexpr auto l = Callable([](auto &&x){}); | ||
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//--- test.cc | ||
// expected-no-diagnostics | ||
import invocable; | ||
import lambda; | ||
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static_assert(is_callable(l, 4) == true); |