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//@ compile-flags: -Z mir-opt-level=3
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//@ build-pass
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use std::fs::File;
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use std::io::{BufRead, BufReader};
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fn file_lines() -> impl Iterator<Item = String> {
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BufReader::new(File::open("").unwrap())
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.lines()
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.map(Result::unwrap)
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}
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fn main() {
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for _ in file_lines() {}
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}
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