Add uniform Tuple.apply and Tuple.unapply #24874
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This implements uniform tuple construction and extraction: Tuple.apply: - transparent inline macro that preserves element types - Works for any arity (0 to 22+) - Tuple() returns EmptyTuple - Tuple(x) returns Tuple1[T] - Tuple(x, y, ...) returns (T1, T2, ...) Tuple.unapply: - Typed overloads for Tuple1-Tuple22 with precise element types - unapplySeq fallback for abstract Tuple types (runtime arity matching) - Enables: case Tuple(a, b) => with typed extraction for concrete types REPL: - Display Tuple1 as "Tuple1(x)" instead of pprint's "(x,)" format
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When matching on abstract Tuple with case Tuple(), the unapplySeq extractor is used. The exhaustivity checker didn't understand that Tuple() via unapplySeq covers EmptyTuple. This adds special handling in the pattern space projection to map Tuple.unapplySeq with empty patterns directly to Typ(EmptyTuple), allowing the exhaustivity checker to correctly determine that case Tuple() covers the EmptyTuple case.
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This implements uniform tuple construction and extraction:
for motivation, see