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fix: avoid backtracking in diagnostic and package-name parsing - #16
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Replace the backtracking regexes in diagnostic suffix removal and scaffold package-name trimming with bounded suffix parsing and linear scans. Long runs of whitespace or punctuation now finish in linear time while preserving the existing formatting and normalization behavior.
Addresses code-scanning alerts #1 and #3.
Validation: the full
bun run checkpassed (268 tests); after adding a long-input regression test and tightening location parsing, 117 compiler tests and all package typechecks passed.git diff --checkpassed.