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Guard against overflow in codemap::span_to_lines. #24976

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Guard against overflow in codemap::span_to_lines. #24976

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7 changes: 7 additions & 0 deletions src/libsyntax/codemap.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -670,6 +670,13 @@ impl CodeMap {
pub fn span_to_lines(&self, sp: Span) -> FileLines {
let lo = self.lookup_char_pos(sp.lo);
let hi = self.lookup_char_pos(sp.hi);

// If you are hitting these errors, perhaps change your
// call-site to call span_to_snippet instead. (Or revise this
// code to return a similar Result...)
assert_eq!(lo.file.name, hi.file.name);
assert!(hi.line >= lo.line);

let mut lines = Vec::with_capacity(hi.line - lo.line + 1);

// The span starts partway through the first line,
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