fix: Off-by-one symbol range for headings ending with supplementary Unicode characters#455
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artempyanykh merged 1 commit intomainfrom Feb 8, 2026
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…nicode characters Use Char.IsHighSurrogate instead of Char.IsSurrogate when computing the end offset in sourceSpanToRange. When a span ends on a low surrogate (the second code unit of a surrogate pair), adding 2 produces an out-of-bounds position. Adding 1 is correct since the position already points to the last code unit. Fixes #453
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Summary
Char.IsHighSurrogateinstead ofChar.IsSurrogateinsourceSpanToRangeto fix incorrect end offset for supplementary Unicode characters (e.g. emoji)Test plan
no453inParserTests.fsFixes #453