src/test/compile-fail/unsafe-trait-impl.rs

   1 // Copyright 2013-2014 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 // Check that safe fns are not a subtype of unsafe fns.
  12
  13 trait Foo {
  14     unsafe fn len(&self) -> u32;
  15 }
  16
  17 impl Foo for u32 {
  18     fn len(&self) -> u32 { *self }
  19     //~^ ERROR method `len` has an incompatible type for trait
  20     //~| expected type `unsafe fn(&u32) -> u32`
  21     //~| found type `fn(&u32) -> u32`
  22 }
  23
  24 fn main() { }