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Shorten the lookup_line code slightly #102536

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Oct 24, 2022
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Shorten the lookup_line code slightly #102536

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5 changes: 1 addition & 4 deletions compiler/rustc_span/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1628,10 +1628,7 @@ impl SourceFile {
/// number. If the source_file is empty or the position is located before the
/// first line, `None` is returned.
pub fn lookup_line(&self, pos: BytePos) -> Option<usize> {
self.lines(|lines| match lines.partition_point(|x| x <= &pos) {
0 => None,
i => Some(i - 1),
})
self.lines(|lines| lines.partition_point(|x| x <= &pos).checked_sub(1))
}

pub fn line_bounds(&self, line_index: usize) -> Range<BytePos> {
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