Handle enum name

Author: som-snytt

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -3875,7 +3875,10 @@ object Parsers {
           then
             report.warning(AmbiguousTemplateName(md), md.namePos)
         md match
-        case md @ TypeDef(name, impl: Template) if impl.body.isEmpty && !md.isBackquoted => checkName(name)
+        case md @ TypeDef(name, impl: Template) if !md.isBackquoted =>
+          val checking = impl.body.isEmpty || false
+          if checking then
+            checkName(name)
         case md @ ModuleDef(name, impl) if impl.body.isEmpty && !md.isBackquoted => checkName(name)
         case _ =>
       checkName()