1/*	$NetBSD: msg_329.c,v 1.5 2023/07/07 19:45:22 rillig Exp $	*/
2# 3 "msg_329.c"
3
4// Test for message: type '%s' is not a member of '%s' [329]
5
6/* lint1-extra-flags: -X 351 */
7
8union u {
9	int i1;
10	int i2;
11	void *vp;
12};
13
14void
15example(void)
16{
17	/*
18	 * A type cast to a union type is valid if the source type is any
19	 * member type of the union.  Since all union members with the same
20	 * type have the same representation, the name of the union member
21	 * doesn't matter.
22	 *
23	 * XXX: could there be padding bits or other tricky details that are
24	 * settable per-member?  These could make the type alone insufficient
25	 * for determining the exact representation.
26	 *
27	 * C99 6.5.4 "Cast operators" does not mention a union cast.  On the
28	 * contrary, it says that the type name shall specify a scalar type.
29	 *
30	 * C11 6.5.4 "Cast operators" differs from C99 but still requires
31	 * scalar types for both the target type and the source value.
32	 *
33	 * This is a GCC extension.
34	 * See https://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html.
35	 */
36	union u u_i1 = (union u)3;
37	union u u_vp = (union u)(void *)0;
38	/* expect+1: error: type 'pointer to char' is not a member of 'union u' [329] */
39	union u u_cp = (union u)(char *)0;
40}
41