tests/ui/overloaded/overloaded-index-in-field.rs

   1 // run-pass
   2 // Test using overloaded indexing when the "map" is stored in a
   3 // field. This caused problems at some point.
   4
   5 use std::ops::Index;
   6
   7 struct Foo {
   8     x: isize,
   9     y: isize,
  10 }
  11
  12 struct Bar {
  13     foo: Foo
  14 }
  15
  16 impl Index<isize> for Foo {
  17     type Output = isize;
  18
  19     fn index(&self, z: isize) -> &isize {
  20         if z == 0 {
  21             &self.x
  22         } else {
  23             &self.y
  24         }
  25     }
  26 }
  27
  28 trait Int {
  29     fn get(self) -> isize;
  30     fn get_from_ref(&self) -> isize;
  31     fn inc(&mut self);
  32 }
  33
  34 impl Int for isize {
  35     fn get(self) -> isize { self }
  36     fn get_from_ref(&self) -> isize { *self }
  37     fn inc(&mut self) { *self += 1; }
  38 }
  39
  40 fn main() {
  41     let f = Bar { foo: Foo {
  42         x: 1,
  43         y: 2,
  44     } };
  45     assert_eq!(f.foo[1].get(), 2);
  46 }