Move @switch to the correct place

Author: nicolasstucki

compiler/src/dotty/tools/dotc/core/StdNames.scala

@@ -688,7 +688,7 @@ object StdNames {
   class ScalaTermNames extends ScalaNames[TermName] {
     protected implicit def fromString(s: String): TermName = termName(s)
 
-    @switch def syntheticParamName(i: Int): TermName = i match {
+    def syntheticParamName(i: Int): TermName = (i: @switch) match {
       case 0  => x_0
       case 1  => x_1
       case 2  => x_2
@@ -702,7 +702,7 @@ object StdNames {
       case _  => termName("x$" + i)
     }
 
-    @switch def productAccessorName(j: Int): TermName = j match {
+    def productAccessorName(j: Int): TermName = (j: @switch) match {
       case 1  => nme._1
       case 2  => nme._2
       case 3  => nme._3

compiler/src/dotty/tools/dotc/printing/PlainPrinter.scala

@@ -443,7 +443,7 @@ class PlainPrinter(_ctx: Context) extends Printer {
 
   def toText(denot: Denotation): Text = toText(denot.symbol) ~ "/D"
 
-  @switch private def escapedChar(ch: Char): String = ch match {
+  private def escapedChar(ch: Char): String = (ch: @switch) match {
     case '\b' => "\\b"
     case '\t' => "\\t"
     case '\n' => "\\n"

library/src/scala/tasty/util/ShowSourceCode.scala

@@ -772,7 +772,7 @@ class ShowSourceCode[T <: Tasty with Singleton](tasty0: T) extends Show[T](tasty
     def +=(x: Char): this.type = { sb.append(x); this }
     def +=(x: String): this.type = { sb.append(x); this }
 
-    @switch private def escapedChar(ch: Char): String = ch match {
+    private def escapedChar(ch: Char): String = (ch: @switch) match {
       case '\b' => "\\b"
       case '\t' => "\\t"
       case '\n' => "\\n"