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[NFC] [C++20] [Modules] Add a test for merging lambda types
Close #57222. This should be fixed with the series of bc73ef0. Add the test case for C++20 Named modules.
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// RUN: rm -rf %t | ||
// RUN: mkdir %t | ||
// RUN: split-file %s %t | ||
// | ||
// RUN: %clang_cc1 -std=c++20 %t/A.cppm -emit-module-interface -o %t/A.pcm | ||
// RUN: %clang_cc1 -std=c++20 %t/B.cppm -emit-module-interface -o %t/B.pcm | ||
// RUN: %clang_cc1 -std=c++20 %t/use.cppm -fprebuilt-module-path=%t -fsyntax-only -verify | ||
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//--- lambda.h | ||
inline auto cmp = [](auto l, auto r) { | ||
return l < r; | ||
}; | ||
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//--- A.cppm | ||
module; | ||
#include "lambda.h" | ||
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export module A; | ||
export auto c1 = cmp; | ||
export using ::cmp; | ||
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//--- B.cppm | ||
module; | ||
#include "lambda.h" | ||
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export module B; | ||
export auto c2 = cmp; | ||
export using ::cmp; | ||
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//--- use.cppm | ||
// expected-no-diagnostics | ||
module; | ||
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export module use; | ||
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import A; | ||
import B; | ||
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static_assert(__is_same(decltype(c1), decltype(c2))); // should succeed. | ||
auto x = cmp; // cmp must not be ambiguous, |