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use partition_point instead of binary_search when looking up source lines #101999

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Merged
merged 1 commit into from
Sep 22, 2022
Merged

use partition_point instead of binary_search when looking up source lines #101999

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7 changes: 3 additions & 4 deletions compiler/rustc_span/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1631,10 +1631,9 @@ 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.binary_search(&pos) {
Ok(idx) => Some(idx),
Err(0) => None,
Err(idx) => Some(idx - 1),
self.lines(|lines| match lines.partition_point(|x| x <= &pos) {
0 => None,
i => Some(i - 1),
})
}

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