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Misc irrelevant work, which I can only offer as-is. It lowers
the noise in -Ycheck:* output and performs some common sense
chillaxes like not screaming ERROR IN INTERNAL CHECKING! WE'RE
ALL GOING TO DIE! when a tree doesn't hit all nine points at
the Jiffy Tree.
You can see some reasonably well reduced symbol flailing if
you run the included pending tests:
test/partest --show-diff test/pending/pos/treecheckers
Example output,
Out of scope symbol reference {
tree TypeTree Factory[Traversable]
position OffsetPosition test/pending/pos/treecheckers/c5.scala:3
with sym ClassSymbol Factory: Factory[CC]
and tpe ClassArgsTypeRef Factory[Traversable]
encl(1) ModuleSymbol object Test5
ref to AbstractTypeSymbol X (<deferred> <param>)
}
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