Simplify Runners

Author: nicolasstucki

compiler/src/dotty/tools/dotc/quoted/Runners.scala

@@ -5,6 +5,12 @@ import scala.runtime.quoted._
 
 /** Default runners for quoted expressions */
 object Runners {
-  implicit def runner[T]: Runner[T] = (expr: Expr[T]) => new QuoteDriver().run(expr)
-  implicit def show[T]: Show[T] = (expr: Expr[T]) => new QuoteDriver().show(expr)
+  implicit def runner[T]: Runner[T] = new Runner[T] {
+
+    def run(expr: Expr[T]): T =
+      new QuoteDriver().run(expr)
+
+    def show(expr: Expr[T]): String =
+      new QuoteDriver().show(expr)
+  }
 }

library/src/scala/quoted/Expr.scala

@@ -1,11 +1,11 @@
 package scala.quoted
 
-import scala.runtime.quoted.{Runner, Show}
+import scala.runtime.quoted.Runner
 
 abstract class Expr[T] extends Quoted {
   final def unary_~ : T = throw new Error("~ should have been compiled away")
   final def run(implicit runner: Runner[T]): T = runner.run(this)
-  final def show(implicit runner: Show[T]): String = runner.run(this)
+  final def show(implicit runner: Runner[T]): String = runner.show(this)
 }
 
 object Expr {

library/src/scala/runtime/quoted/Runner.scala

@@ -6,4 +6,5 @@ import scala.quoted.Expr
 @implicitNotFound("Could not find implicit Runner. Default runner can must be imported with `import dotty.tools.dotc.quoted.Runners._`")
 trait Runner[T] {
   def run(expr: Expr[T]): T
+  def show(expr: Expr[T]): String
 }