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Avoid erasure/preErasure issues around Any in transformIsInstanceOf #21647

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Merged
merged 3 commits into from
Nov 2, 2024
Merged

Avoid erasure/preErasure issues around Any in transformIsInstanceOf #21647

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d02d4b8
Avoid erasure/preErasure issues around Any in transformIsInstanceOf
dwijnand Sep 25, 2024
7b721f0
Simplify transformIsInstanceOf check
dwijnand Oct 30, 2024
49d876a
Add extra isInstanceOf test cases
dwijnand Nov 2, 2024
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3 changes: 2 additions & 1 deletion compiler/src/dotty/tools/dotc/transform/TypeTestsCasts.scala
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Expand Up @@ -256,7 +256,8 @@ object TypeTestsCasts {
else foundClasses.exists(check)
end checkSensical

if (expr.tpe <:< testType) && inMatch then
val tp = if expr.tpe.isPrimitiveValueType then defn.boxedType(expr.tpe) else expr.tpe
if tp <:< testType && inMatch then
if expr.tpe.isNotNull then constant(expr, Literal(Constant(true)))
else expr.testNotNull
else {
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4 changes: 4 additions & 0 deletions tests/pos/i21544.scala
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@@ -0,0 +1,4 @@
class Test():
def m1(xs: List[Boolean]) = for (x: Any) <- xs yield x
def m2(xs: List[Boolean]) = for (x: AnyVal) <- xs yield x
def m3(xs: List[Boolean]) = for (x: Matchable) <- xs yield x
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A few more suggestions for tests:

  def m1(xs: List[AnyVal]) = for (x: Any) <- xs yield x
  def m1(xs: List[AnyVal]) = for (x: Matchable) <- xs yield x
  def m1(xs: List[Matchable]) = for (x: Any) <- xs yield x
  def m1(xs: List[Any]) = for (x: Any) <- xs yield x

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