gcc/testsuite/gdc.test/compilable/test14962.d

   1 template map(fun...)
   2 {
   3     auto map(R)(R r)
   4     {
   5         return MapResult!(fun, R)(r);
   6     }
   7 }
   8
   9 struct MapResult(alias fun, R)
  10 {
  11     R _input;
  12
  13     @property bool empty() { return _input.length == 0; }
  14     @property auto front() { return fun(_input[0]); }
  15     void popFront() { _input = _input[1..$]; }
  16 }
  17
  18 struct Foo
  19 {
  20     int baz(int v)
  21     {
  22         static int id;
  23         return v + id++;
  24     }
  25     void bar()
  26     {
  27         auto arr1 = [1, 2, 3];
  28         auto arr2 = [4, 5, 6];
  29         arr1.map!(
  30             // lambda1
  31             i =>
  32                 arr2.map!(
  33                     // lambda2
  34                     j =>
  35                         baz(i + j)
  36                 )
  37         );
  38     }
  39 }
  40
  41 void main() {}