diff options
| -rw-r--r-- | src/compiler/scala/tools/nsc/transform/patmat/MatchAnalysis.scala | 6 | ||||
| -rw-r--r-- | test/files/pos/t9369.flags | 1 | ||||
| -rw-r--r-- | test/files/pos/t9369.scala | 24 |
3 files changed, 30 insertions, 1 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/patmat/MatchAnalysis.scala b/src/compiler/scala/tools/nsc/transform/patmat/MatchAnalysis.scala index a11906ace1..1331eb6993 100644 --- a/src/compiler/scala/tools/nsc/transform/patmat/MatchAnalysis.scala +++ b/src/compiler/scala/tools/nsc/transform/patmat/MatchAnalysis.scala @@ -150,7 +150,11 @@ trait TreeAndTypeAnalysis extends Debugging { acc: List[List[Type]]): List[List[Type]] = wl match { case hd :: tl => val children = enumerateChildren(hd) - groupChildren(tl ++ children, acc :+ filterChildren(children)) + // put each trait in a new group, since traits could belong to the same + // group as a derived class + val (traits, nonTraits) = children.partition(_.isTrait) + val filtered = (traits.map(List(_)) ++ List(nonTraits)).map(filterChildren) + groupChildren(tl ++ children, acc ++ filtered) case Nil => acc } diff --git a/test/files/pos/t9369.flags b/test/files/pos/t9369.flags new file mode 100644 index 0000000000..b5a8748652 --- /dev/null +++ b/test/files/pos/t9369.flags @@ -0,0 +1 @@ +-Xfatal-warnings -unchecked diff --git a/test/files/pos/t9369.scala b/test/files/pos/t9369.scala new file mode 100644 index 0000000000..94be2ea4e7 --- /dev/null +++ b/test/files/pos/t9369.scala @@ -0,0 +1,24 @@ +object Test { + + trait Tree + + sealed abstract class Prop + + trait Simple extends Prop + + case class Atom(tree: Tree) extends Prop with Simple + + case class Not(prop: Prop) extends Prop with Simple + + def simplify1(prop: Prop): Prop = prop match { + case Atom(tree) => ??? + case Not(prop) => ??? + case _ => ??? + } + + def simplify2(prop: Prop): Prop = prop match { + case Not(Atom(tree)) => ??? + case Not(Not(prop)) => ??? + case _ => ??? + } +}
\ No newline at end of file |