src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java

*** 3401,3412 ****
      }
  
      Name typeName() {
          int pos = token.pos;
          Name name = ident();
!         if (isRestrictedLocalVarTypeName(name)) {
              reportSyntaxError(pos, "var.not.allowed", name);
          }
          return name;
      }
  
      /** InterfaceDeclaration = INTERFACE Ident TypeParametersOpt
--- 3401,3416 ----
      }
  
      Name typeName() {
          int pos = token.pos;
          Name name = ident();
!         if (name == names.var) {
!             if (Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source)) {
                  reportSyntaxError(pos, "var.not.allowed", name);
+             } else {
+                 warning(pos, "var.not.allowed", name);
+             }
          }
          return name;
      }
  
      /** InterfaceDeclaration = INTERFACE Ident TypeParametersOpt