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Dealias in isSimpleThrowable check #24744

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Merged
hamzaremmal merged 1 commit into from
Dec 17, 2025
Merged

Dealias in isSimpleThrowable check #24744

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/transform/TryCatchPatterns.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -71,7 +71,7 @@ class TryCatchPatterns extends MiniPhase {
case _ => isDefaultCase(cdef)
}

private def isSimpleThrowable(tp: Type)(using Context): Boolean = tp.stripped match {
private def isSimpleThrowable(tp: Type)(using Context): Boolean = tp.strippedDealias match {
case tp @ TypeRef(pre, _) =>
(pre == NoPrefix || pre.typeSymbol.isStatic) && // Does not require outer class check
!tp.symbol.is(Flags.Trait) && // Traits not supported by JVM
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15 changes: 15 additions & 0 deletions tests/run/i24357.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
class E1 extends Exception
class E2 extends Exception

type E1or2 = E1 | E2

def caughtE1orE2(body: => Nothing): Boolean =
try body
catch
case ex: E1or2 => true
case _ => false

@main def Test =
assert(caughtE1orE2(throw new E1 {}))
assert(caughtE1orE2(throw new E2 {}))
assert(!caughtE1orE2(throw new Exception {}))
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