src/test/compile-fail/unboxed-closure-illegal-move.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 #![feature(unboxed_closures)]
  12
  13 // Tests that we can't move out of an unboxed closure environment
  14 // if the upvar is captured by ref or the closure takes self by
  15 // reference.
  16
  17 fn to_fn<A,F:Fn<A>>(f: F) -> F { f }
  18 fn to_fn_mut<A,F:FnMut<A>>(f: F) -> F { f }
  19 fn to_fn_once<A,F:FnOnce<A>>(f: F) -> F { f }
  20
  21 fn main() {
  22     // By-ref cases
  23     {
  24         let x = Box::new(0);
  25         let f = to_fn(|| drop(x)); //~ ERROR cannot move
  26     }
  27     {
  28         let x = Box::new(0);
  29         let f = to_fn_mut(|| drop(x)); //~ ERROR cannot move
  30     }
  31     {
  32         let x = Box::new(0);
  33         let f = to_fn_once(|| drop(x)); // OK -- FnOnce
  34     }
  35     // By-value cases
  36     {
  37         let x = Box::new(0);
  38         let f = to_fn(move || drop(x)); //~ ERROR cannot move
  39     }
  40     {
  41         let x = Box::new(0);
  42         let f = to_fn_mut(move || drop(x)); //~ ERROR cannot move
  43     }
  44     {
  45         let x = Box::new(0);
  46         let f = to_fn_once(move || drop(x)); // this one is ok
  47     }
  48 }