Backport "Fix enclosingClass from returning refinement classes" to 3.3 LTS #49
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Looking at how i20952 is compiled, the call
ctx.owner.enclosingClass.derivesFrom(sym.owner)
in SuperAccessors (that I moved to ProtectedAccessors) accidentally
fails, because the refinement class returned as the enclosing class of
`val prog` doesn't derive from SuperClass. But if the enclosing class
of `prog` returned is `trait Child` then no super accessor call is
necessary.
[Cherry-picked 15922f9]
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Backports scala#21411 to the 3.3.6.
PR submitted by the release tooling.
[skip ci]