Fix #4935: make desugaring optimization sound #6309
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We can only optimize `val pat = if (...) e1 else e2` if: - `e1` and `e2` are both tuples of arity N - `pat` is a tuple of N variables or wildcard patterns like `(x1, x2, ..., xN)` Otherwise, we need to generate pattern matches.
liufengyun
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Fix #4935: remove unsound optimization