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Fix #7872: Add regression test #8494

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Merged
merged 1 commit into from
Mar 10, 2020
Merged

Fix #7872: Add regression test #8494

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3 changes: 2 additions & 1 deletion compiler/test/dotc/pos-test-pickling.blacklist
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@ matchtype.scala
6322.scala
i7087.scala
i7868.scala
i7872.scala

# Opaque type
i5720.scala
Expand All @@ -37,4 +38,4 @@ i7580.scala
nullable.scala

# parameter untupling with overloaded functions (see comment in Applications.normArg)
i7757.scala
i7757.scala
23 changes: 23 additions & 0 deletions tests/pos/i7872.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
object Test {
def flip: (x: 0 | 1) => x.type match { case 0 => 1 case 1 => 0 } = ???
flip(0): 1
flip(1): 0
flip(if ??? then 0 else 1)
val n: 0 | 1 = if ??? then 0 else 1
flip(n)
val m: n.type match { case 0 => 1 case 1 => 0 } = flip(n)
}

object Test2 {
type Flip[N <: 0 | 1] <: 0 | 1 = N match { case 0 => 1 case 1 => 0 }
def flip: (x: 0 | 1) => Flip[x.type] = ???
flip(0): 1
flip(1): 0
}

object Test3 {
type Flip[N <: 0 | 1] <: 0 | 1 = N match { case 0 => 1 case 1 => 0 }
def flip(x: 0 | 1): Flip[x.type] = ???
flip(0): 1
flip(1): 0
}