gcc/testsuite/gdc.test/fail_compilation/fail9537.d

   1 /*
   2 TEST_OUTPUT:
   3 ---
   4 fail_compilation/fail9537.d(26): Error: `foo(tuple(1, 2))` is not an lvalue and cannot be modified
   5 ---
   6 */
   7
   8 struct Tuple(T...)
   9 {
  10     T field;
  11     alias field this;
  12 }
  13
  14 Tuple!T tuple(T...)(T args)
  15 {
  16     return Tuple!T(args);
  17 }
  18
  19 auto ref foo(T)(auto ref T t)
  20 {
  21     return t[0];    // t[0] is deduced to non-ref
  22 }
  23
  24 void main()
  25 {
  26     int* p = &foo(tuple(1, 2));
  27 }