WIP: do not merge. (Proof of concept implementation of one-element-tuple-syntax, matherial to discussion) #24591
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- Add preserveTrailingComma flag to Scanner Region class to prevent trailing comma from being silently consumed in tuple contexts - Update Parser to use the flag in expression, type, and pattern parsing - Implement empty tuple syntax (,) for expressions, types, and patterns - Add inParensWithTrailingComma helper for cleaner tuple parsing - Ensure (a,<newline>) and (a, b,<newline>) are correctly parsed as tuples - Add tests for single/multi-element tuples, empty tuples, and multiline variants
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