body:      `p := C.f15(); p.a = [10]*C.char{new(C.char)}; C.f15b(p)`,
		fail:      true,
		expensive: true,
	},
	{
		// Storing a Go pointer into C memory using a slice
		// copy should fail.
		name: "barrierslice",
		c: `#include <stdlib.h>
		    struct s16 { char *a[10]; };
		    struct s16 *f16() { return malloc(sizeof(struct s16)); }
		    void f16b(struct s16 *p) {}`,