pub unsafe extern "C" fn gr_vec_contains(
vec: *const gr_vec_struct,
x: gr_srcptr,
ctx: *mut gr_ctx_struct,
) -> truth_tpub unsafe extern "C" fn gr_vec_contains(
vec: *const gr_vec_struct,
x: gr_srcptr,
ctx: *mut gr_ctx_struct,
) -> truth_t