src/test/ui/nll/issue-21114-kixunil.rs

// (this works, but only in NLL)
// compile-pass
#![feature(nll)]

fn from_stdin(min: u64) -> Vec<u64> {
    use std::io::BufRead;

    let stdin = std::io::stdin();
    let stdin = stdin.lock();

    stdin.lines()
        .map(Result::unwrap)
        .map(|val| val.parse())
        .map(Result::unwrap)
        .filter(|val| *val >= min)
        .collect()
}

fn main() {}