gcc/testsuite/gdc.test/fail_compilation/diag13884.d

   1 /*
   2 TEST_OUTPUT:
   3 ---
   4 fail_compilation/diag13884.d(14): Error: functions cannot return a sequence (use `std.typecons.Tuple`)
   5 fail_compilation/diag13884.d(21):        instantiated from here: `MapResult!((t) => t.tupleof, Foo[])`
   6 fail_compilation/diag13884.d(14):        instantiated from here: `map!(Foo[])`
   7 ---
   8 */
   9
  10 struct Foo { int x; }
  11
  12 void main()
  13 {
  14     [Foo(1)].map!(t => t.tupleof);
  15 }
  16
  17 template map(fun...)
  18 {
  19     auto map(Range)(Range r)
  20     {
  21         return MapResult!(fun, Range)(r);
  22     }
  23 }
  24
  25 struct MapResult(alias fun, R)
  26 {
  27     R _input;
  28
  29     @property auto ref front()
  30     {
  31         return fun(_input[0]);
  32     }
  33
  34 }