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Revert the removal of the
@
fromTy
as I think it caused the memory regression seen here in #7615. The graph posted on that PR is from before this change.Since
Ty
is a recursive type, I think that the change from@
to~
meant that a copy that would previously stop at the@
continued. It seems to me that during syntax folding, the data was being kept around somehow, causing the bloat.This reverts commit 47eca21.