1 /* { dg-do assemble } */
2 /* { dg-options "-O1" }*/
3 // This was PR C++/31165
4 // We used to copy the whole decl when we just wantted to
5 // unshare some expressions for the default argument.
6 class string {
7   char *ptr;
8   int len;
9   int sz;
10 };
11 class cset { }  _cset_init;
12 string an_empty_string;
13 void f(string& = an_empty_string);
14 void
h(void)15 h (void )
16 {
17 f();
18 }
19 
20 
21