Fix extractor printing

Author: nicolasstucki

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

@@ -507,7 +507,11 @@ class ShowSourceCode[T <: Tasty with Singleton](tasty0: T) extends Show[T](tasty
         printPattern(pattern)
 
       case Pattern.Unapply(fun, implicits, patterns) =>
-        printTree(fun)
+        fun match {
+          case Term.Select(extractor, "unapply" | "unapplySeq", _) => printTree(extractor)
+          case Term.TypeApply(Term.Select(extractor, "unapply" | "unapplySeq", _), _) => printTree(extractor)
+          case _ => throw new MatchError(fun.show)
+        }
         this += "("
         printPatterns(patterns, ", ")
         this += ")"
@@ -516,7 +520,8 @@ class ShowSourceCode[T <: Tasty with Singleton](tasty0: T) extends Show[T](tasty
         printPatterns(trees, " | ")
 
       case Pattern.TypeTest(tpt) =>
-        this
+        this += "_: "
+        printTypeOrBoundsTree(tpt)
 
     }
 
@@ -542,8 +547,8 @@ class ShowSourceCode[T <: Tasty with Singleton](tasty0: T) extends Show[T](tasty
         printTypeTree(hi)
       case tpt @ SyntheticBounds() =>
         printTypeOrBound(tpt.tpe)
-      case tpt@Type() =>
-        printType(tpt)
+      case tpt @ TypeTree() =>
+        printTypeTree(tpt)
     }
 
     def printTypeTree(tree: TypeTree): Buffer = tree match {