src/test/ui/impl-trait-in-bindings.rs

   1 // run-pass
   2
   3 #![feature(impl_trait_in_bindings)]
   4 //~^ WARN the feature `impl_trait_in_bindings` is incomplete and may cause the compiler to crash
   5
   6 use std::fmt::Debug;
   7
   8 const FOO: impl Debug + Clone + PartialEq<i32> = 42;
   9
  10 static BAR: impl Debug + Clone + PartialEq<i32> = 42;
  11
  12 fn a<T: Clone>(x: T) {
  13     let y: impl Clone = x;
  14     let _ = y.clone();
  15 }
  16
  17 fn b<T: Clone>(x: T) {
  18     let f = move || {
  19         let y: impl Clone = x;
  20         let _ = y.clone();
  21     };
  22     f();
  23 }
  24
  25 trait Foo<T: Clone> {
  26     fn a(x: T) {
  27         let y: impl Clone = x;
  28         let _ = y.clone();
  29     }
  30 }
  31
  32 impl<T: Clone> Foo<T> for i32 {
  33     fn a(x: T) {
  34         let y: impl Clone = x;
  35         let _ = y.clone();
  36     }
  37 }
  38
  39 fn main() {
  40     let foo: impl Debug + Clone + PartialEq<i32> = 42;
  41
  42     assert_eq!(FOO.clone(), 42);
  43     assert_eq!(BAR.clone(), 42);
  44     assert_eq!(foo.clone(), 42);
  45
  46     a(42);
  47     b(42);
  48     i32::a(42);
  49 }