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Deskolemise patterns to suppress exhaustivity warnings #13137

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Aug 26, 2021
Merged

Deskolemise patterns to suppress exhaustivity warnings #13137

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5 changes: 1 addition & 4 deletions compiler/src/dotty/tools/dotc/transform/patmat/Space.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -354,11 +354,8 @@ class SpaceEngine(using Context) extends SpaceLogic {
case pat: Ident if isBackquoted(pat) =>
Typ(pat.tpe, decomposed = false)

case Ident(nme.WILDCARD) =>
Typ(erase(pat.tpe.stripAnnots, isValue = true), decomposed = false)

case Ident(_) | Select(_, _) =>
Typ(erase(pat.tpe.stripAnnots, isValue = true), decomposed = false)
Typ(erase(pat.tpe.stripAnnots.widenSkolem, isValue = true), decomposed = false)

case Alternative(trees) =>
Or(trees.map(project(_)))
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12 changes: 12 additions & 0 deletions tests/patmat/i13110.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
object Test {
sealed trait Base
class Blub extends Base
object Blub {
def unapply(blub: Blub): Some[(Int, blub.type)] =
Some(1 -> blub)
}

(null: Base) match {
case Blub(i, x) => println(i)
}
}