| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| // |
| // This code used to produce the following ICE: |
| // |
| // error: internal compiler error: get_unique_type_id_of_type() - |
| // unexpected type: closure, |
| // TyClosure(syntax::ast::DefId{krate: 0, node: 66}, |
| // ReScope(63)) |
| // |
| // This is a regression test for issue #17021. |
| // |
| // compile-flags: -g |
| |
| |
| #![feature(unboxed_closures)] |
| |
| use std::ptr; |
| |
| pub fn replace_map<'a, T, F>(src: &mut T, prod: F) where F: FnOnce(T) -> T { |
| unsafe { *src = prod(ptr::read(src as *mut T as *const T)); } |
| } |
| |
| pub fn main() { |
| let mut a = 7; |
| let b = &mut a; |
| replace_map(b, |x: usize| x * 2); |
| assert_eq!(*b, 14); |
| } |
