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"Alias replacement" has been with us since 2005 (13c59adf9).
Given:
package a {
class C1(val v0: String)
class C2(v1: String) extends a.C1(v1) { v1 }
}
The reference to `v1` is rewritten as `C2.super.v0()`, and
no field is generated in `C2`.
(Oddly, this optimization doesn't seem to kick in if
these classes are in the empty package. That's probably
a distinct bug.)
However, this rewriting is done without consideration of
the accessibility of `v0` from `C2`.
This commit disables this optimization if there if `v0` is
not accessible.
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