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// run-pass
// Regression test for issue #19499. Due to incorrect caching of trait
// results for closures with upvars whose types were not fully
// computed, this rather bizarre little program (along with many more
// reasonable examples) let to ambiguity errors about not being able
// to infer sufficient type information.
// pretty-expanded FIXME #23616
fn main() {
let n = 0;
let it = Some(1_usize).into_iter().inspect(|_| {n;});
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