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16 lines
435 B
Rust
16 lines
435 B
Rust
#![feature(unboxed_closures, tuple_trait)]
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use std::io::Read;
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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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let x = 1;
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to_fn_once(move|| { x = 2; });
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//~^ ERROR: cannot assign to `x`, as it is not declared as mutable
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let s = std::io::stdin();
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to_fn_once(move|| { s.read_to_end(&mut Vec::new()); });
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//~^ ERROR: cannot borrow `s` as mutable, as it is not declared as mutable
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}
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