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Exports: Refine canForward for selections on this #22503

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Exports: Refine canForward for selections on this #22503

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8f18883
Export: Refine canForward for selections on this
bracevac Feb 3, 2025
29c9945
Exports: Improve detection of selections on this
bracevac Feb 3, 2025
bf1e938
Update comment
bracevac Feb 4, 2025
30cdc57
Add selections on self types in isAbstractMember
bracevac Feb 4, 2025
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14 changes: 13 additions & 1 deletion compiler/src/dotty/tools/dotc/typer/Namer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1175,11 +1175,23 @@ class Namer { typer: Typer =>
def canForward(mbr: SingleDenotation, alias: TermName): CanForward = {
import CanForward.*
val sym = mbr.symbol
/**
* Check the export selects an abstract member (issue #22147).
*/
def isAbstractMember: Boolean = sym.is(Deferred) && (expr match
case ths: This if ths.qual.isEmpty => true
case _ => false
)
if !sym.isAccessibleFrom(pathType) then
No("is not accessible")
else if sym.isConstructor || sym.is(ModuleClass) || sym.is(Bridge) || sym.is(ConstructorProxy) || sym.isAllOf(JavaModule) then
Skip
else if cls.derivesFrom(sym.owner) && (sym.owner == cls || !sym.is(Deferred)) then
// if the cls is a subclass of the owner of the symbol
// and either
// * the symbols owner is the cls itself
// * the symbol is not a deferred symbol
// * the symbol is an abstract member #22147
else if cls.derivesFrom(sym.owner) && (sym.owner == cls || !sym.is(Deferred) || isAbstractMember) then
No(i"is already a member of $cls")
else if pathMethod.exists && mbr.isType then
No("is a type, so it cannot be exported as extension method")
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5 changes: 5 additions & 0 deletions tests/neg/exports3.scala
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@@ -0,0 +1,5 @@
trait P:
def foo: Int

class A extends P:
export this.foo // error