src/test/compile-fail/unboxed-closure-feature-gate.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 // Check that parenthetical notation is feature-gated except with the
  12 // `Fn` traits.
  13
  14 use std::marker;
  15
  16 trait Foo<A> {
  17     type Output;
  18
  19     fn dummy(&self, a: A) { }
  20 }
  21
  22 fn main() {
  23     let x: Box<Foo(isize)>;
  24     //~^ ERROR parenthetical notation is only stable when used with `Fn`-family
  25
  26     // No errors with these:
  27     let x: Box<Fn(isize)>;
  28     let x: Box<FnMut(isize)>;
  29     let x: Box<FnOnce(isize)>;
  30 }