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This field tracks whether the type is an inferred
on, subject to removal in `resetAttrs`, or an explicit
type, which must remain.
In ae5ff662, `ResetAttrs` was modified to duplicate
trees, rather than mutate trees in place. But the
tree copier didn't pass `wasEmpty` on to the new tree,
which in turn meant that the subsequent typing run
on the tree would not re-infer the types. If the
type refers to a local class, e.g. the anonymous
function in the enclosed test case, the reference
to the old symbol would persist.
This commit overrides `copyAttrs` in TypeTree to
copy `wasEmpty`.
We might consider representing this as a tree
attachment, but this would need to be validated
for the performance impact.
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