src/test/compile-fail/trait-coercion-generic-bad.rs

   1 // Copyright 2012 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 struct Struct {
  12     person: &'static str
  13 }
  14
  15 trait Trait<T> {
  16     fn f(&self, x: T);
  17 }
  18
  19 impl Trait<&'static str> for Struct {
  20     fn f(&self, x: &'static str) {
  21         println!("Hello, {}!", x);
  22     }
  23 }
  24
  25 fn main() {
  26     // FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
  27     let s: Box<Trait<isize>> = Box::new(Struct { person: "Fred" });
  28     //~^ ERROR `Struct: Trait<isize>` is not satisfied
  29     s.f(1);
  30 }