llvm-project/clang/test/Sema/struct-compat.c

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/* RUN: clang %s -fsyntax-only -pedantic -verify
*/
extern struct {int a;} x; // expected-error{{previous definition is here}}
extern struct {int a;} x; // expected-error{{redefinition of 'x'}}
struct x;
int a(struct x* b) {
// FIXME: This test currently fails
// Per C99 6.7.2.3, since the outer and inner "struct x"es have different
// scopes, they don't refer to the same type, and are therefore incompatible
struct x {int a;} *c = b;
}
struct x {int a;} r;
int b() {
// FIXME: This test currently also fails
struct x {char x;} s = r;
}