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An upcoming change to uncurry, in which I plan to make substitution of
`lambda params -> apply method params` requires that I first to fix a
problem in symbol substition.
This situation can arise when the body of this definition:
def owner1(a: A) = {
class C extends M[a.B]
}
is transplanted into a new owner that has a different symbol for `a`.
I speculated that value classes might also be prone to the
fact that symbol substitution neglected `ClassInfoType#parents`.
We can test change with Value Classes: Partial Functions that are
dependent on value class param type used to fail with a spurious
overriding error, now they work correctly.
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