//@ run-pass | |
#![allow(unused_variables)] | |
// Test that you can supply `&F` where `F: FnMut()`. | |
#![feature(lang_items)] | |
fn a<F:FnMut() -> i32>(mut f: F) -> i32 { | |
f() | |
} | |
fn b(f: &mut dyn FnMut() -> i32) -> i32 { | |
a(f) | |
} | |
fn c<F:FnMut() -> i32>(f: &mut F) -> i32 { | |
a(f) | |
} | |
fn main() { | |
let z: isize = 7; | |
let x = b(&mut || 22); | |
assert_eq!(x, 22); | |
let x = c(&mut || 22); | |
assert_eq!(x, 22); | |
} |