ResolveSuper: add missing methods overrides for disambiguation #5662
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In mixin-overrides.scala, when we compute the overrides for QInt in ResolveSuper, we need to add an override for Baz#op because it matches the concrete method Bar#op (otherwise we'll get a "Conflicting default methods" error at runtime). Before this commit, this did not happen because Baz#op was not considered to match Bar#op, because one refers to Baz.this.A and the other to Bar.this.A. We fix this by calling `matchingDenotation` with a `targetType` corresponding to the current class (`QInt` here) instead of the trait where the denotation is defined. This also allows us to remove the PrimitiveForwarders mini-phase which was apparently doing a subset of this work and is now redundant.
odersky
approved these changes
Dec 29, 2018
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In mixin-overrides.scala, when we compute the overrides for QInt in
ResolveSuper, we need to add an override for Baz#op because it matches
the concrete method Bar#op (otherwise we'll get a "Conflicting default
methods" error at runtime). Before this commit, this did not happen
because Baz#op was not considered to match Bar#op, because one refers to
Baz.this.A and the other to Bar.this.A.
We fix this by calling
matchingDenotationwith atargetTypecorresponding to the current class (
QInthere) instead of thetrait where the denotation is defined.
This also allows us to remove the PrimitiveForwarders mini-phase which was
apparently doing a subset of this work and is now redundant.