Render alternatives in PEG-safe order - #12
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Limitation: only alternatives that *are* string literals benefit from longest-first ordering; prefix shadowing between alternatives that merely *start* the same way (e.g. two concatenations sharing a leading rulename) is not detected. Fixes: Nadrieril#11 Assisted-by: Pi:moonshot/kimi-k3
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Fixes #11.
Render each alternation stable-sorted: can't-fail alternatives last (pest_derive rejects them elsewhere), string literals longest-first (avoids prefix shadowing). Everything else keeps written order. Doing it at render time fixes both written and
=/-merged alternations at once.Limitation: longest-first applies only to alternatives that are string literals, not ones that merely start alike.