src/test/ui/compare-method/traits-misc-mismatch-1.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10 //
  11 // Make sure rustc checks the type parameter bounds in implementations of traits,
  12 // see #2687
  13
  14 use std::marker;
  15
  16 trait A { }
  17
  18 trait B: A {}
  19
  20 trait C: A {}
  21
  22 trait Foo {
  23     fn test_error1_fn<T: Eq>(&self);
  24     fn test_error2_fn<T: Eq + Ord>(&self);
  25     fn test_error3_fn<T: Eq + Ord>(&self);
  26     fn test3_fn<T: Eq + Ord>(&self);
  27     fn test4_fn<T: Eq + Ord>(&self);
  28     fn test_error5_fn<T: A>(&self);
  29     fn test6_fn<T: A + Eq>(&self);
  30     fn test_error7_fn<T: A>(&self);
  31     fn test_error8_fn<T: B>(&self);
  32 }
  33
  34 impl Foo for isize {
  35     // invalid bound for T, was defined as Eq in trait
  36     fn test_error1_fn<T: Ord>(&self) {}
  37     //~^ ERROR E0276
  38
  39     // invalid bound for T, was defined as Eq + Ord in trait
  40     fn test_error2_fn<T: Eq + B>(&self) {}
  41     //~^ ERROR E0276
  42
  43     // invalid bound for T, was defined as Eq + Ord in trait
  44     fn test_error3_fn<T: B + Eq>(&self) {}
  45     //~^ ERROR E0276
  46
  47     // multiple bounds, same order as in trait
  48     fn test3_fn<T: Ord + Eq>(&self) {}
  49
  50     // multiple bounds, different order as in trait
  51     fn test4_fn<T: Eq + Ord>(&self) {}
  52
  53     // parameters in impls must be equal or more general than in the defining trait
  54     fn test_error5_fn<T: B>(&self) {}
  55     //~^ ERROR E0276
  56
  57     // bound `std::cmp::Eq` not enforced by this implementation, but this is OK
  58     fn test6_fn<T: A>(&self) {}
  59
  60     fn test_error7_fn<T: A + Eq>(&self) {}
  61     //~^ ERROR E0276
  62
  63     fn test_error8_fn<T: C>(&self) {}
  64     //~^ ERROR E0276
  65 }
  66
  67 trait Getter<T> {
  68     fn get(&self) -> T { loop { } }
  69 }
  70
  71 trait Trait {
  72     fn method<G:Getter<isize>>(&self);
  73 }
  74
  75 impl Trait for usize {
  76     fn method<G: Getter<usize>>(&self) {}
  77     //~^ ERROR E0276
  78 }
  79
  80 fn main() {}