Rename experimental feature to subCases

Avoids the issue with match completion with suggests importing the feature.

Author: EugeneFlesselle

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

@@ -37,7 +37,7 @@ object Feature:
   val modularity = experimental("modularity")
   val quotedPatternsWithPolymorphicFunctions = experimental("quotedPatternsWithPolymorphicFunctions")
   val packageObjectValues = experimental("packageObjectValues")
-  val matchWithSubCases = experimental("matchWithSubCases")
+  val subCases = experimental("subCases")
 
   def experimentalAutoEnableFeatures(using Context): List[TermName] =
     defn.languageExperimentalFeatures

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -3108,7 +3108,7 @@ object Parsers {
         (withinMatchPattern(pattern()), guard())
       }
       val body =
-        if in.token == WITH && in.featureEnabled(Feature.matchWithSubCases) then atSpan(in.skipToken()):
+        if in.token == WITH && in.featureEnabled(Feature.subCases) then atSpan(in.skipToken()):
           subMatchClause(simpleExpr(Location.ElseWhere))
         else atSpan(accept(ARROW)):
           if exprOnly then

library/src/scala/language.scala

@@ -350,10 +350,10 @@ object language {
     @compileTimeOnly("`packageObjectValues` can only be used at compile time in import statements")
     object packageObjectValues
 
-    /** Experimental support for match expressions with sub-cases.
+    /** Experimental support for match expressions with sub cases.
      */
-    @compileTimeOnly("`matchWithSubCases` can only be used at compile time in import statements")
-    object matchWithSubCases
+    @compileTimeOnly("`subCases` can only be used at compile time in import statements")
+    object subCases
 
   }
 

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

@@ -155,10 +155,10 @@ object language:
     @compileTimeOnly("`packageObjectValues` can only be used at compile time in import statements")
     object packageObjectValues
 
-    /** Experimental support for match expressions with sub-cases.
+    /** Experimental support for match expressions with sub cases.
      */
-    @compileTimeOnly("`matchWithSubCases` can only be used at compile time in import statements")
-    object matchWithSubCases
+    @compileTimeOnly("`subCases` can only be used at compile time in import statements")
+    object subCases
   end experimental
 
   /** The deprecated object contains features that are no longer officially suypported in Scala.

tests/pos/inline-sub-match.scala renamed to tests/pos/inline-match-sub-cases.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.matchWithSubCases
+import scala.language.experimental.subCases
 
 object Test:
 

tests/pos/sub-sub-match.scala renamed to tests/pos/match-sub-sub-cases.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.matchWithSubCases
+import scala.language.experimental.subCases
 
 object Test:
   val x: Option[Option[Int]] = ???

tests/run/sub-catch.scala renamed to tests/run/catch-sub-cases.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.matchWithSubCases
+import scala.language.experimental.subCases
 
 enum E extends Exception:
   case A(x: Any)

tests/run/sub-cases.scala renamed to tests/run/match-sub-cases.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.matchWithSubCases
+import scala.language.experimental.subCases
 
 enum E:
   case A(e: E)

tests/run/pf-sub-cases.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.matchWithSubCases
+import scala.language.experimental.subCases
 
 val pf: PartialFunction[Option[Option[Int]], String] =
   case Some(x2) with x2 match

tests/warn/sub-cases-exhaustivity.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.matchWithSubCases
+import scala.language.experimental.subCases
 
 enum E:
   case A(e: E)