Change Printers to givens

Author: odersky

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

@@ -3,7 +3,8 @@ package printing
 
 import core._
 import Texts._, Types._, Flags._, Names._, Symbols._, NameOps._, Constants._, Denotations._
-import Contexts.Context, Scopes.Scope, Denotations.Denotation, Annotations.Annotation
+import Contexts.{Context}
+import Scopes.Scope, Denotations.Denotation, Annotations.Annotation
 import StdNames.nme
 import ast.Trees._
 import typer.Implicits._
@@ -18,7 +19,8 @@ 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 curCtx: Context = _ctx.addMode(Mode.Printing)
+  protected given ctx[Dummy] as Context = curCtx
 
   protected def printDebug = ctx.settings.YprintDebug.value
 

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

@@ -9,7 +9,7 @@ import Names._
 import Symbols._
 import NameOps._
 import TypeErasure.ErasedValueType
-import Contexts.Context
+import Contexts.{Context}
 import Annotations.Annotation
 import Denotations._
 import SymDenotations._
@@ -32,11 +32,11 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
 
   /** A stack of enclosing DefDef, TypeDef, or ClassDef, or ModuleDefs nodes */
   private var enclosingDef: untpd.Tree = untpd.EmptyTree
-  private var myCtx: Context = super.ctx
+  private var myCtx: Context = super.curCtx
   private var printPos = ctx.settings.YprintPos.value
   private val printLines = ctx.settings.printLines.value
 
-  override protected implicit def ctx: Context = myCtx
+  override protected def curCtx: Context = myCtx
 
   def withEnclosingDef(enclDef: Tree[? >: Untyped])(op: => Text): Text = {
     val savedCtx = myCtx