36 lines
921 B
Rust
36 lines
921 B
Rust
#![feature(unboxed_closures)]
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// Tests that we can't assign to or mutably borrow upvars from `Fn`
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// closures (issue #17780)
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fn set(x: &mut usize) { *x = 5; }
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fn to_fn<A,F:Fn<A>>(f: F) -> F { f }
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fn to_fn_mut<A,F:FnMut<A>>(f: F) -> F { f }
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fn main() {
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// By-ref captures
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{
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let mut x = 0;
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let _f = to_fn(|| x = 42); //~ ERROR cannot assign
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let mut y = 0;
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let _g = to_fn(|| set(&mut y)); //~ ERROR cannot borrow
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let mut z = 0;
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let _h = to_fn_mut(|| { set(&mut z); to_fn(|| z = 42); }); //~ ERROR cannot assign
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}
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// By-value captures
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{
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let mut x = 0;
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let _f = to_fn(move || x = 42); //~ ERROR cannot assign
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let mut y = 0;
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let _g = to_fn(move || set(&mut y)); //~ ERROR cannot borrow
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let mut z = 0;
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let _h = to_fn_mut(move || { set(&mut z); to_fn(move || z = 42); }); //~ ERROR cannot assign
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}
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}
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