Slight refactoring of context handling in printers

Author: odersky

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

@@ -15,7 +15,11 @@ import scala.util.control.NonFatal
 import scala.annotation.switch
 
 class PlainPrinter(_ctx: Context) extends Printer {
+  /** The context of all public methods in Printer and subclasses.
+   *  Overridden in RefinedPrinter.
+   */
   protected implicit def ctx: Context = _ctx.addMode(Mode.Printing)
+
   protected def printDebug = ctx.settings.YprintDebug.value
 
   private var openRecs: List[RecType] = Nil

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

@@ -714,12 +714,12 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
   }
 
   /** Print modifiers from symbols if tree has type, overriding the untpd behavior. */
-  implicit def modsDeco(mdef: untpd.DefTree)(implicit ctx: Context): untpd.ModsDecorator =
+  private implicit def modsDeco(mdef: untpd.DefTree): untpd.ModsDecorator =
     new untpd.ModsDecorator {
       def mods = if (mdef.hasType) Modifiers(mdef.symbol) else mdef.rawMods
     }
 
-  def Modifiers(sym: Symbol)(implicit ctx: Context): Modifiers = untpd.Modifiers(
+  private def Modifiers(sym: Symbol): Modifiers = untpd.Modifiers(
     sym.flags & (if (sym.isType) ModifierFlags | VarianceFlags else ModifierFlags),
     if (sym.privateWithin.exists) sym.privateWithin.asType.name else tpnme.EMPTY,
     sym.annotations.filterNot(ann => dropAnnotForModText(ann.symbol)).map(_.tree))

compiler/src/dotty/tools/dotc/transform/ExplicitOuter.scala

@@ -346,6 +346,7 @@ object ExplicitOuter {
    *     no later than erasure.
    */
   class OuterOps(val ictx: Context) extends AnyVal {
+    /** The context of all operations of this class */
     private implicit def ctx: Context = ictx
 
     /** If `cls` has an outer parameter add one to the method type `tp`. */