src/test/run-pass/unboxed-closures-unique-type-id.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 // This code used to produce the following ICE:
  12 //
  13 //    error: internal compiler error: get_unique_type_id_of_type() -
  14 //    unexpected type: closure,
  15 //    TyClosure(syntax::ast::DefId{krate: 0, node: 66},
  16 //    ReScope(63))
  17 //
  18 // This is a regression test for issue #17021.
  19 //
  20 // compile-flags: -g
  21
  22
  23 #![feature(unboxed_closures)]
  24
  25 use std::ptr;
  26
  27 pub fn replace_map<'a, T, F>(src: &mut T, prod: F) where F: FnOnce(T) -> T {
  28     unsafe { *src = prod(ptr::read(src as *mut T as *const T)); }
  29 }
  30
  31 pub fn main() {
  32     let mut a = 7;
  33     let b = &mut a;
  34     replace_map(b, |x: usize| x * 2);
  35     assert_eq!(*b, 14);
  36 }