39 lines
1.0 KiB
Rust
39 lines
1.0 KiB
Rust
#![feature(unboxed_closures, tuple_trait)]
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// Tests that we can't move out of an unboxed closure environment
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// if the upvar is captured by ref or the closure takes self by
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// reference.
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fn to_fn<A:std::marker::Tuple,F:Fn<A>>(f: F) -> F { f }
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fn to_fn_mut<A:std::marker::Tuple,F:FnMut<A>>(f: F) -> F { f }
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fn to_fn_once<A:std::marker::Tuple,F:FnOnce<A>>(f: F) -> F { f }
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fn main() {
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// By-ref cases
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{
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let x = Box::new(0);
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let f = to_fn(|| drop(x)); //~ ERROR cannot move
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}
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{
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let x = Box::new(0);
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let f = to_fn_mut(|| drop(x)); //~ ERROR cannot move
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}
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{
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let x = Box::new(0);
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let f = to_fn_once(|| drop(x)); // OK -- FnOnce
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}
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// By-value cases
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{
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let x = Box::new(0);
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let f = to_fn(move || drop(x)); //~ ERROR cannot move
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}
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{
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let x = Box::new(0);
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let f = to_fn_mut(move || drop(x)); //~ ERROR cannot move
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}
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{
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let x = Box::new(0);
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let f = to_fn_once(move || drop(x)); // this one is ok
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}
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}
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