Upgrade to Scala.js 1.20.2. (scala#24898)

And forward-port scala-js/scala-js#5288

Author: sjrd

library-js/src/scala/MatchError.scala

@@ -0,0 +1,44 @@
+/*
+ * Scala (https://www.scala-lang.org)
+ *
+ * Copyright EPFL and Lightbend, Inc. dba Akka
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ *
+ * See the NOTICE file distributed with this work for
+ * additional information regarding copyright ownership.
+ */
+
+package scala
+
+/** This class implements errors which are thrown whenever an
+ *  object doesn't match any pattern of a pattern matching
+ *  expression.
+ */
+final class MatchError(@transient obj: Any) extends RuntimeException {
+  /** There's no reason we need to call toString eagerly,
+   *  so defer it until getMessage is called or object is serialized
+   */
+  private[this] lazy val objString = {
+    if (obj == null) "null"
+    else {
+      val cls = obj.getClass()
+      val ofClass =
+        if (cls == null) "of a JS class"
+        else s"of class ${cls.getName()}"
+      try s"$obj ($ofClass)"
+      catch {
+        case _: Throwable => "an instance " + ofClass
+      }
+    }
+  }
+
+  @throws[java.io.ObjectStreamException]
+  private def writeReplace(): Object = {
+    objString
+    this
+  }
+
+  override def getMessage() = objString
+}

project/plugins.sbt

@@ -6,7 +6,7 @@
 libraryDependencySchemes +=
   "org.scala-lang.modules" %% "scala-xml" % VersionScheme.Always
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.20.1")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.20.2")
 
 addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.2.1")
 

tests/run/classTags.scala

@@ -1,4 +1,3 @@
-// scalajs: --skip --pending
 object Test {
   type T = String