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In code like:
object O { val x = A; def x(a: Any) = ... }
object P extends O.x.A
The unpickler was using an overloaded symbol for `x` in the
parent type of `P`. This led to compilation failures under
separate compilation.
The code that leads to this is in `Unpicklers`:
def fromName(name: Name) = name.toTermName match {
case nme.ROOT => loadingMirror.RootClass
case nme.ROOTPKG => loadingMirror.RootPackage
case _ => adjust(owner.info.decl(name))
}
This commit filters the overloaded symbol based its stability
unpickling a singleton type. That seemed a slightly safer place
than in `fromName`.
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