diff options
| -rw-r--r-- | compiler/rustc_span/src/lib.rs | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs index 366fd9d2cd1..d8ba3d57864 100644 --- a/compiler/rustc_span/src/lib.rs +++ b/compiler/rustc_span/src/lib.rs @@ -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> { |