llvm-project/clang/test/Preprocessor/annotate_in_macro_arg.c

// RUN: %clang_cc1 -verify %s
#define M1() // expected-note{{macro 'M1' defined here}}

M1( // expected-error{{unterminated function-like macro invocation}}

#if M1() // expected-error{{expected value in expression}}
#endif
#pragma pack()