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//@ run-pass
// This code used to produce the following ICE:
//
// error: internal compiler error: get_unique_type_id_of_type() -
// unexpected type: closure,
// Closure(rustc_ast::DefId{krate: 0, node: 66},
// ReScope(63))
//
// This is a regression test for issue #17021.
//
//@ compile-flags: -g
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);
}
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