Fix tests/pos/{i143,extmethods}.scala: value classes must have exactly one val param

Author: smarter

tests/pos/extmethods.scala

@@ -1,5 +1,5 @@
 trait That1[A]
-class T[A, This <: That1[A]] extends AnyVal {
+class T[A, This <: That1[A]](val x: Int) extends AnyVal {
   self: This =>
   var next: This = _
   final def loop(x: This, cnt: Int): Int = loop(x, cnt + 1)

tests/pos/i143.scala

@@ -5,9 +5,7 @@ import dotty.tools.dotc.core.Denotations._
 import dotty.tools.dotc.core.Symbols._
 import dotty.tools.dotc.core.Contexts._
 
-class TC5 extends AnyVal {
-  implicit val ctx: Context = ???
-
+class TC5(val ctx: Context) extends AnyVal {
   def candidates(mbr: SingleDenotation): Boolean = {
     mbr.symbol.denot(ctx).exists
   }