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/* { dg-do assemble } */

/* { dg-options "-O1" }*/

// This was PR C++/31165

// We used to copy the whole decl when we just wantted to

// unshare some expressions for the default argument.

class string {

  char *ptr;

  int len;

  int sz;

};

class cset { }  _cset_init;

string an_empty_string;

void f(string& = an_empty_string);

void

h (void )

{

f();

}