src/test/run-pass/issue-868.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 fn f<T, F>(g: F) -> T where F: FnOnce() -> T { g() }
  12
  13 pub fn main() {
  14   let _x = f( | | { 10 });
  15     // used to be: cannot determine a type for this expression
  16     f(| | { });
  17     // ditto
  18     f( | | { ()});
  19     // always worked
  20     let _: () = f(| | { });
  21     // empty block with no type info should compile too
  22     let _ = f(||{});
  23     let _ = (||{});
  24 }