src/test/run-pass/unboxed-closures-monomorphization.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 // Test that unboxed closures in contexts with free type parameters
  12 // monomorphize correctly (issue #16791)
  13
  14 fn main(){
  15     fn bar<'a, T:Clone+'a> (t: T) -> Box<FnMut()->T + 'a> {
  16         Box::new(move || t.clone())
  17     }
  18
  19     let mut f = bar(42_u32);
  20     assert_eq!(f(), 42);
  21
  22     let mut f = bar("forty-two");
  23     assert_eq!(f(), "forty-two");
  24
  25     let x = 42_u32;
  26     let mut f = bar(&x);
  27     assert_eq!(f(), &x);
  28
  29     #[derive(Clone, Copy, Debug, PartialEq)]
  30     struct Foo(usize, &'static str);
  31
  32     let x = Foo(42, "forty-two");
  33     let mut f = bar(x);
  34     assert_eq!(f(), x);
  35 }