Revert "add source versions 3.2 and 3.2-migration"

This reverts commit bd5a808.

Author: griggt

compiler/src/dotty/tools/dotc/config/Feature.scala

@@ -91,7 +91,7 @@ object Feature:
   def warnOnMigration(msg: Message, pos: SrcPos,
       version: SourceVersion)(using Context): Boolean =
     if sourceVersion.isMigrating && sourceVersion.stable == version
-       || (version == `3.0` || version == `3.1` || version == `3.2`) && migrateTo3
+       || (version == `3.0` || version == `3.1`) && migrateTo3
     then
       report.migrationWarning(msg, pos)
       true

compiler/src/dotty/tools/dotc/config/ScalaSettings.scala

@@ -51,7 +51,7 @@ trait AllScalaSettings extends CommonScalaSettings, PluginSettings, VerboseSetti
   /* Path related settings */
   val semanticdbTarget: Setting[String] = PathSetting("-semanticdb-target", "Specify an alternative output directory for SemanticDB files.", "")
 
-  val source: Setting[String] = ChoiceSetting("-source", "source version", "source version", List("3.0", "3.1", "3.2", "future", "3.0-migration", "3.1-migration", "3.2-migration", "future-migration"), "3.0", aliases = List("--source"))
+  val source: Setting[String] = ChoiceSetting("-source", "source version", "source version", List("3.0", "3.1", "future", "3.0-migration", "future-migration"), "3.0", aliases = List("--source"))
   val uniqid: Setting[Boolean] = BooleanSetting("-uniqid", "Uniquely tag all identifiers in debugging output.", aliases = List("--unique-id"))
   val rewrite: Setting[Option[Rewrites]] = OptionSetting[Rewrites]("-rewrite", "When used in conjunction with a `...-migration` source version, rewrites sources to migrate to new version.", aliases = List("--rewrite"))
   val fromTasty: Setting[Boolean] = BooleanSetting("-from-tasty", "Compile classes from tasty files. The arguments are .tasty or .jar files.", aliases = List("--from-tasty"))

compiler/src/dotty/tools/dotc/config/SourceVersion.scala

@@ -6,7 +6,7 @@ import core.Decorators.*
 import util.Property
 
 enum SourceVersion:
-  case `3.0-migration`, `3.0`, `3.1-migration`, `3.1`, `3.2-migration`, `3.2`, `future-migration`, `future`
+  case `3.0-migration`, `3.0`, `3.1`, `future-migration`, `future`
 
   val isMigrating: Boolean = toString.endsWith("-migration")
 

library/src/scala/runtime/stdLibPatches/language.scala

@@ -162,6 +162,7 @@ object language:
   @compileTimeOnly("`3.1` can only be used at compile time in import statements")
   object `3.1`
 
+/* This can be added when we go to 3.2
   /** Set source version to 3.2-migration.
     *
     * @see [[https://scalacenter.github.io/scala-3-migration-guide/docs/scala-3-migration-mode]]
@@ -175,4 +176,5 @@ object language:
     */
   @compileTimeOnly("`3.2` can only be used at compile time in import statements")
   object `3.2`
+*/
 end language