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//@ run-pass
//@ pretty-expanded FIXME #23616
#![deny(unused_mut)]
#![allow(unused_must_use)]
// Test that mutating a mutable upvar in a capture-by-value unboxed
// closure does not ice (issue #18238) and marks the upvar as used
// mutably so we do not get a spurious warning about it not needing to
// be declared mutable (issue #18336 and #18769)
fn set(x: &mut usize) { *x = 42; }
fn main() {
{
let mut x = 0_usize;
move || x += 1; //~ WARN unused variable: `x`
}
{
let mut x = 0_usize;
move || x += 1; //~ WARN unused variable: `x`
}
{
let mut x = 0_usize;
move || set(&mut x);
}
{
let mut x = 0_usize;
move || set(&mut x);
}
}
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