Include P in the implicit scope of P.this.type
#17088
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Before this commit, `one` compiled but `two` didn't in:
class Foo[+T]
class Elem:
def one(a: Elem, x: Foo[a.type]): Int = x.ext
def two(x: Foo[Elem.this.type]): Int = x.ext
object Elem:
extension (x: Foo[Elem]) def ext: Int = 1
This happened because the anchors of the singleton reference `a.type` includes
its underlying type `Elem`, but `Elem.this.type` has no anchors at all. This
commit changes the definition of anchors to rectify this, which also brings us
closer to how Scala 2 behaves.
odersky
approved these changes
Mar 12, 2023
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Before this commit,
onecompiled buttwodidn't in:This happened because the anchors of the singleton reference
a.typeincludes its underlying typeElem, butElem.this.typehas no anchors at all. This commit changes the definition of anchors to rectify this, which also brings us closer to how Scala 2 behaves.