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int main()
{
	struct a;
	a * p;
	union b;
	b * p1;
	enum c;
	c * p2;
}

prog.c: In function ‘main’:
prog.c:4: error: ‘a’ undeclared (first use in this function)
prog.c:4: error: (Each undeclared identifier is reported only once
prog.c:4: error: for each function it appears in.)
prog.c:4: error: ‘p’ undeclared (first use in this function)
prog.c:6: error: ‘b’ undeclared (first use in this function)
prog.c:6: error: ‘p1’ undeclared (first use in this function)
cc1: warnings being treated as errors
prog.c:7: error: ISO C forbids forward references to ‘enum’ types
prog.c:8: error: ‘c’ undeclared (first use in this function)
prog.c:8: error: ‘p2’ undeclared (first use in this function)

Standard output is empty