Fix #7965: Deal with AndTypes in joins #7992
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Allow that the base type of a join may be a conjunction.
smarter requested changes Jan 15, 2020
| tp1.derivedAppliedType( | ||
| mergeRefinedOrApplied(tycon1, tycon2), | ||
| ctx.typeComparer.lubArgs(args1, args2, tycon1.typeParams)) | ||
| case AndType(tp21, tp22) => |
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This handles having tp1 be an AppliedType and tp2 be an AndType, but it seems that we'd need similar special cases when tp1 is a RefinedType and tp2 is an AndType, etc. Instead maybe all calls to fail in this method could be replaced by a fallback that handles the recursion when tp2 is an AndType.
smarter requested changes Jan 15, 2020
| tp2 match { | ||
| case tp2 @ TypeRef(pre2, _) if tp1.name eq tp2.name => | ||
| tp1.derivedSelect(pre1 | pre2) | ||
| case _ => fail |
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The fallback is also necessary here, otherwise the following would crash:
class Outer { class Elem } class Test { val o1: Outer = ??? val o2: Outer = ??? val o3: Outer = ??? val x: o1.Elem | (o2.Elem & o3.Elem) def foo[T <: Outer#Elem](has: T): T = ??? foo(x) }
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Allow that the base type of a join may be a conjunction.