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Rework support of Iterator.iterator optimization in ForLoopsLowering

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- Fix the predicate used for finding the member function `next`: check
  that there's no extension receiver parameter, don't filter out
  abstract functions.
- Do not copy iterator expression, instead change the type in all
  references to the iterator variable.
- Fix some style issues.

 #KT-47171 Fixed
This commit is contained in:
Alexander Udalov
2022-02-25 23:24:35 +01:00
committed by Alexander Udalov
parent 1b776bd5b6
commit 157db778fd
15 changed files with 293 additions and 172 deletions
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compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/IrTypeUtils.kt
+3
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@@ -29,6 +29,9 @@ fun IrClassifierSymbol.isStrictSubtypeOfClass(superClass: IrClassSymbol): Boolea
fun IrType.isSubtypeOfClass(superClass: IrClassSymbol): Boolean =
this is IrSimpleType && classifier.isSubtypeOfClass(superClass)
fun IrType.isStrictSubtypeOfClass(superClass: IrClassSymbol): Boolean =
this is IrSimpleType && classifier.isStrictSubtypeOfClass(superClass)
fun IrType.isSubtypeOf(superType: IrType, typeSystem: IrTypeSystemContext): Boolean =
AbstractTypeChecker.isSubtypeOf(createIrTypeCheckerState(typeSystem), this, superType)