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Reverts part of c82ecab. The parser can't assume that
a pattern `(a, b)` will match, as results of
`.isInstanceOf[Tuple2]` can't be statically known until
after the typer.
The reopens SI-1336, SI-5589 and SI-4574, in exchange for fixing
this regression SI-6968. Keeping all of those fixed will require
a better definition of irrefutability, and some acrobatics to
ensure safe passage to the ambiguous trees through typechecking.
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This reverts commit d8ba5d091e5641553b438ef9930a6023a2709dcd.
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Temporary reversion of irrefutability commits in interests
of stable milestone. Expect to restore shortly.
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The parser has always been confused about tuple patterns in
for comprehensions. It thinks it can fail to recognize an
irrefutable pattern and have it removed in refchecks, but it
is sadly mistaken, because the unnecessary filter has a tendency
to fail the compile in typer.
Look more intently for irrefutable patterns and don't insert
the unnecessary filter. Closes SI-5589, SI-1336.
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