llvm-project/clang/test/Modules/decldef.mm

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// RUN: rm -rf %t
// RUN: %clang_cc1 -fmodules -I %S/Inputs -fmodules-cache-path=%t %s -verify
// In other file: expected-note {{previous definition is here}}
@import decldef;
A *a1; // expected-error{{unknown type name 'A'}}
B *b1; // expected-error{{unknown type name 'B'}}
@import decldef.Decl;
A *a2;
B *b;
void testA(A *a) {
a->ivar = 17; // expected-error{{definition of 'A' must be imported from module 'decldef.Def' before it is required}}
}
void testB() {
B b; // Note: redundant error silenced
}