Do not print ".type" for singleton literal types

Author: nicolasstucki

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

@@ -622,7 +622,10 @@ class ShowSourceCode[T <: Tasty with Singleton](tasty0: T) extends Show[T](tasty
 
       case TypeTree.Singleton(ref) =>
         printTree(ref)
-        this += ".type"
+        ref match {
+          case Term.Literal(_) => this
+          case _ => this += ".type"
+        }
 
       case TypeTree.Refined(tpt, refinements) =>
         printTypeTree(tpt)

tests/pos/simpleSingleton.decompiled

@@ -4,6 +4,8 @@ class Foo() {
     val a: x.type = x
     val b: Foo.type = Foo
     val c: Foo.Bar.type = Foo.Bar
+    val d: 1 = 1
+    val e: "abc" = "abc"
     ()
   }
 }

tests/pos/simpleSingleton.scala

@@ -3,6 +3,8 @@ class Foo {
     val a: x.type = x
     val b: Foo.type = Foo
     val c: Foo.Bar.type = Foo.Bar
+    val d: 1 = 1
+    val e: "abc" = "abc"
   }
 }