Patch tree bounds printer

Author: nicolasstucki

compiler/src/scala/quoted/runtime/impl/printers/SourceCode.scala

@@ -1345,18 +1345,22 @@ object SourceCode {
     }
 
     private def printBoundsTree(bounds: TypeBoundsTree)(using elideThis: Option[Symbol]): this.type = {
-      bounds.low match {
-        case Inferred() =>
-        case low =>
-          this += " >: "
-          printTypeTree(low)
-      }
-      bounds.hi match {
-        case Inferred() => this
-        case hi =>
-          this += " <: "
-          printTypeTree(hi)
-      }
+      if bounds.low.tpe =:= bounds.hi.tpe then
+        this += " = "
+          printTypeTree(bounds.low)
+      else
+        bounds.low match {
+          case Inferred() =>
+          case low =>
+            this += " >: "
+            printTypeTree(low)
+        }
+        bounds.hi match {
+          case Inferred() => this
+          case hi =>
+            this += " <: "
+            printTypeTree(hi)
+        }
     }
 
     private def printBounds(bounds: TypeBounds)(using elideThis: Option[Symbol]): this.type = {