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#include <stdio.h>
 
#define I_HATE_MACRO2(a, b) a ## b
#define I_HATE_MACRO(a, b) I_HATE_MACRO2(a, b)
#define ASSERT_ARRAY(a) \
    typedef struct { \
        int I_HATE_MACRO(must_be_an_array_,__LINE__) : ((void*)&(a) == (void*)(a)); \
    } I_HATE_MACRO(must_be_an_array_,__LINE__)
 
int main() {
    int test[] = {1,2,3};
    int test2;
    int *test3;
 
    ASSERT_ARRAY(test);
    ASSERT_ARRAY(test2);
    ASSERT_ARRAY(test3);
 
    return 0;
}

prog.c: In function ‘main’:
prog.c:16: error: bit-field ‘must_be_an_array_16’ width not an integer constant
prog.c:17: error: bit-field ‘must_be_an_array_17’ width not an integer constant

Standard output is empty