clang/test/Modules/merge-concepts-cxx-modules.cpp

   1 // RUN: rm -rf %t
   2 // RUN: mkdir %t
   3 // RUN: split-file %s %t
   4 //
   5 // RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/same_as.cppm -o %t/same_as.pcm
   6 // RUN: %clang_cc1 -std=c++20 -emit-module-interface -fprebuilt-module-path=%t %t/concepts.cppm -o %t/concepts.pcm
   7 // RUN: %clang_cc1 -std=c++20 -emit-module-interface -fprebuilt-module-path=%t %t/format.cppm -o %t/format.pcm
   8 // RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/conflicting.cppm -o %t/conflicting.pcm
   9 // RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use.cppm -fsyntax-only -verify
  10
  11 //--- same_as.cppm
  12 export module same_as;
  13 export template <class T, class U>
  14 concept same_as = __is_same(T, U);
  15
  16 //--- concepts.cppm
  17 export module concepts;
  18 export import same_as;
  19
  20 export template <class T>
  21 concept ConflictingConcept = true;
  22
  23 //--- format.cppm
  24
  25 export module format;
  26 export import concepts;
  27 export import same_as;
  28
  29 export template <class T> void foo()
  30   requires same_as<T, int>
  31 {}
  32
  33 //--- conflicting.cppm
  34 export module conflicting;
  35 export template <class T, class U = int>
  36 concept ConflictingConcept = true;
  37
  38 //--- Use.cppm
  39 import format;
  40 import conflicting;
  41
  42 template <class T> void foo()
  43   requires same_as<T, T>
  44 {}
  45 ConflictingConcept auto x = 10; // expected-error {{reference to 'ConflictingConcept' is ambiguous}}
  46                                 // expected-note@* 2 {{candidate}}