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Given:
class C {
trait T { C.this } // C$T$$$outer$ : C
object T extends T { C.this } // C$T$$$outer$ : C.this.type
}
object T ended up with a definitions for both of the accessors.
These cannot co-exist, as they have the same erased type. A crash
ensued almost immediately in explitouter.
Fortunately, the solution is straightforward: we can just omit
the mixin outer accessor altogether, the objects own outer accessor
is compatible with it.
scala> :javap C.T
Compiled from "<console>"
public interface C$T{
public abstract C C$T$$$outer();
}
scala> :javap C.T$
Compiled from "<console>"
public class C$T$ extends java.lang.Object implements C$T{
public C C$T$$$outer();
public C$T$(C);
}
I also added an assertion to give a better error message in
case we find ourselves here again.
Also includes tests from SI-3994, which I'll mark as a duplicate.
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