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Nowarn extension matching nonpublic member #21825

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Nowarn extension matching nonpublic member #21825

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d0fdbfb
Nowarn extension matching nonpublic member
som-snytt Oct 22, 2024
ae1b583
Prefer isPublic in RefChecks
som-snytt Oct 22, 2024
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25 changes: 13 additions & 12 deletions compiler/src/dotty/tools/dotc/typer/RefChecks.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -525,7 +525,6 @@ object RefChecks {

// todo: align accessibility implication checking with isAccessible in Contexts
def isOverrideAccessOK =
val memberIsPublic = (member.flags & AccessFlags).isEmpty && !member.privateWithin.exists
def protectedOK = !other.is(Protected) || member.is(Protected) // if o is protected, so is m
def accessBoundaryOK =
val ob = other.accessBoundary(member.owner)
Expand All @@ -534,7 +533,7 @@ object RefChecks {
def companionBoundaryOK = ob.isClass && !ob.isLocalToBlock && mb.is(Module) && (ob.companionModule eq mb.companionModule)
ob.isContainedIn(mb) || companionBoundaryOK // m relaxes o's access boundary,
def otherIsJavaProtected = other.isAllOf(JavaProtected) // or o is Java defined and protected (see #3946)
memberIsPublic || protectedOK && (accessBoundaryOK || otherIsJavaProtected)
member.isPublic || protectedOK && (accessBoundaryOK || otherIsJavaProtected)
end isOverrideAccessOK

if !member.hasTargetName(other.targetName) then
Expand Down Expand Up @@ -1169,16 +1168,18 @@ object RefChecks {
target.nonPrivateMember(sym.name)
.filterWithPredicate:
member =>
val memberIsImplicit = member.info.hasImplicitParams
val paramTps =
if memberIsImplicit then methTp.stripPoly.firstParamTypes
else methTp.firstExplicitParamTypes

paramTps.isEmpty || memberIsImplicit && !methTp.hasImplicitParams || {
val memberParamTps = member.info.stripPoly.firstParamTypes
!memberParamTps.isEmpty
&& memberParamTps.lengthCompare(paramTps) == 0
&& memberParamTps.lazyZip(paramTps).forall((m, x) => x frozen_<:< m)
member.symbol.isPublic && {
val memberIsImplicit = member.info.hasImplicitParams
val paramTps =
if memberIsImplicit then methTp.stripPoly.firstParamTypes
else methTp.firstExplicitParamTypes

paramTps.isEmpty || memberIsImplicit && !methTp.hasImplicitParams || {
val memberParamTps = member.info.stripPoly.firstParamTypes
!memberParamTps.isEmpty
&& memberParamTps.lengthCompare(paramTps) == 0
&& memberParamTps.lazyZip(paramTps).forall((m, x) => x frozen_<:< m)
}
}
.exists
if !target.typeSymbol.denot.isAliasType && !target.typeSymbol.denot.isOpaqueAlias && hidden
Expand Down
17 changes: 17 additions & 0 deletions tests/warn/i21816.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@

case class CC(a: String, b: String) extends Iterable[String] {
override def iterator: Iterator[String] = Iterator(a, b)
}

trait T {
extension (cc: CC) def className: String = "foo"
}

object O extends T {
def foo = {
val cc = CC("a", "b")
println(cc.className)
}
}

@main def main() = O.foo
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