fmt.Fprintf(&b, "#line %d \"not-declared\"\n"+
			"void __cgo_f_%d_1(void) { __typeof__(%s) *__cgo_undefined__1; }\n"+
			"#line %d \"not-type\"\n"+
			"void __cgo_f_%d_2(void) { %s *__cgo_undefined__2; }\n"+
			"#line %d \"not-int-const\"\n"+
			"void __cgo_f_%d_3(void) { enum { __cgo_undefined__3 = (%s)*1 }; }\n"+
			"#line %d \"not-num-const\"\n"+
			"void __cgo_f_%d_4(void) { static const double __cgo_undefined__4 = (%s); }\n"+

		// The cgo call may have caused a stack copy (via a callback).
		// Adjust the return value pointer appropriately.
		fmt.Fprintf(fgcc, "\t_cgo_a = (void*)((char*)_cgo_a + (_cgo_topofstack() - _cgo_stktop));\n")
		// Save the return value.
		fmt.Fprintf(fgcc, "\t_cgo_a->r = _cgo_r;\n")
		// The return value is on the Go stack. If we are using msan,
		// and if the C value is partially or completely uninitialized,