file compiled by gcc, the file x.cgo2.c:

	void
	_cgo_be59f0f25121_Cfunc_puts(void *v)
	{
		struct {
			char* p0;
			int r;
			char __pad12[4];
		} __attribute__((__packed__, __gcc_struct__)) *a = v;
		a->r = puts((void*)a->p0);
	}

It extracts the arguments from the pointer to _Cfunc_puts's argument
frame, invokes the system C function (in this case, puts), stores the