Fix #22226: Use classOf[BoxedUnit] for Unit array in ArrayConstructors.
#22238
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…structors`. The `ArrayConstructors` phase rewrites array constructors to calls to `scala.runtime.Arrays.newArray`. When it does that, it must pass the run-time `jl.Class` of the element type. Previously, it used `classOf[Unit]` when creating an `Array[Unit]` (or nested). That is not correct, as from the Java perspective, we need to create `Array[BoxedUnit]`. We now identify `elemType <: Unit` and replace it with `BoxedUnit`. --- This highlights a limitation of the Scala.js backend. We should rewrite calls to `newArray` in the backend to use direct array creation instead.
hamzaremmal
approved these changes
Dec 18, 2024
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The
ArrayConstructorsphase rewrites array constructors to calls toscala.runtime.Arrays.newArray. When it does that, it must pass the run-timejl.Classof the element type. Previously, it usedclassOf[Unit]when creating anArray[Unit](or nested). That is not correct, as from the Java perspective, we need to createArray[BoxedUnit].We now identify
elemType <: Unitand replace it withBoxedUnit.This highlights a limitation of the Scala.js backend. We should rewrite calls to
newArrayin the backend to use direct array creation instead.