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Fix extracting the elemType of a union of arrays #16569

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Merged
merged 1 commit into from
Dec 22, 2022
Merged

Fix extracting the elemType of a union of arrays #16569

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5 changes: 4 additions & 1 deletion compiler/src/dotty/tools/dotc/core/TypeApplications.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -533,6 +533,9 @@ class TypeApplications(val self: Type) extends AnyVal {
case JavaArrayType(elemtp) => elemtp
case tp: OrType if tp.tp1.isBottomType => tp.tp2.elemType
case tp: OrType if tp.tp2.isBottomType => tp.tp1.elemType
case _ => self.baseType(defn.SeqClass).argInfos.headOption.getOrElse(NoType)
case _ =>
self.baseType(defn.SeqClass)
.orElse(self.baseType(defn.ArrayClass))
.argInfos.headOption.getOrElse(NoType)
}
}
8 changes: 8 additions & 0 deletions tests/pos/i16562.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
class Test:
val a: Array[Any] = Array[Any]()
val b: Array[Any] = Array[Any]()

def ko(p: Boolean): Unit = foo((if p then a else b): _*)
def ok(p: Boolean): Unit = foo({ val x = if p then a else b; x }: _*)

def foo(in: Any*): Unit = ()