mirror of https://github.com/rust-lang/rust
23 lines
686 B
Rust
23 lines
686 B
Rust
#![feature(unboxed_closures,tuple_trait)]
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use std::ops::FnMut;
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fn to_fn_mut<A:std::marker::Tuple, F:FnMut<A>>(f: F) -> F { f }
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fn call_it<F: FnMut(isize, isize) -> isize>(y: isize, mut f: F) -> isize {
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//~^ NOTE required by this bound in `call_it`
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//~| NOTE required by a bound in `call_it`
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f(2, y)
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}
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pub fn main() {
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let f = to_fn_mut(|x: usize, y: isize| -> isize { (x as isize) + y });
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//~^ NOTE found signature defined here
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let z = call_it(3, f);
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//~^ ERROR type mismatch
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//~| NOTE expected due to this
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//~| NOTE expected closure signature `fn(isize, _) -> _`
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//~| NOTE required by a bound introduced by this call
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println!("{}", z);
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}
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