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DO NOT MERGE: Replace overflowing sub with checked_sub. #134361

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DO NOT MERGE: Replace overflowing sub with checked_sub. #134361

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9 changes: 8 additions & 1 deletion compiler/rustc_errors/src/emitter.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,14 @@ impl Margin {

if self.computed_right - self.computed_left > self.column_width {
// Trimming only whitespace isn't enough, let's get craftier.
if self.label_right - self.whitespace_left <= self.column_width {

// Note: self.label_right - self.whitespace_left will overflow in the case that the label
// is addressing whitespace. This happens when a spurious no-breaking-space (\u{a0})
// is present in the whitespace.
if let Some(non_whitespace_label_width) =
self.label_right.checked_sub(self.whitespace_left)
&& non_whitespace_label_width <= self.column_width
{
// Attempt to fit the code window only trimming whitespace.
self.computed_left = self.whitespace_left;
self.computed_right = self.computed_left + self.column_width;
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