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// RUN: %clang_cc1 -std=c++20 %s -verify -o /dev/null
// RUN: %clang_cc1 -std=c++20 %s -DINTERFACE -verify -emit-module-interface -o %t
// RUN: %clang_cc1 -std=c++20 %s -DIMPLEMENTATION -verify -fmodule-file=A=%t -o /dev/null
//
// RUN: %clang_cc1 -std=c++20 %s -DBUILT_AS_INTERFACE -emit-module-interface -verify -o /dev/null
// RUN: %clang_cc1 -std=c++20 %s -DINTERFACE -DBUILT_AS_INTERFACE -emit-module-interface -verify -o /dev/null
// RUN: %clang_cc1 -std=c++20 %s -DIMPLEMENTATION -DBUILT_AS_INTERFACE -emit-module-interface -verify -o /dev/null
#if INTERFACE
// expected-no-diagnostics
export module A;
#elif IMPLEMENTATION
module A; // #module-decl
#ifdef BUILT_AS_INTERFACE
// expected-error@-2 {{missing 'export' specifier in module declaration while building module interface}}
#define INTERFACE
#endif
#else
#ifdef BUILT_AS_INTERFACE
// expected-error@1 {{missing 'export module' declaration in module interface unit}}
#endif
#endif
#ifndef INTERFACE
export int b; // expected-error {{export declaration can only be used within a module purview}}
#ifdef IMPLEMENTATION
// expected-note@#module-decl {{add 'export' here}}
#endif
#else
export int a;
#endif
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