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//! Regression test for issue #1818
//! last-use analysis in closures should allow moves instead of requiring copies.
//!
//! The original issue was that the compiler incorrectly flagged certain return values
//! in anonymous functions/closures as requiring copies of non-copyable values, when
//! they should have been treated as moves (since they were the last use of the value).
//!
//! See: https://github.com/rust-lang/rust/issues/1818
//@ run-pass
fn apply<T, F>(s: String, mut f: F) -> T
where
F: FnMut(String) -> T
{
fn g<T, F>(s: String, mut f: F) -> T
where
F: FnMut(String) -> T
{
f(s)
}
g(s, |v| {
let r = f(v);
r // This should be a move, not requiring copy
})
}
pub fn main() {
// Actually test the functionality
let result = apply(String::from("test"), |s| s.len());
assert_eq!(result, 4);
}
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