src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java

@@ -4442,11 +4442,11 @@
     public void visitModuleDef(JCModuleDecl tree) {
         tree.sym.completeUsesProvides();
         ModuleSymbol msym = tree.sym;
         Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
         Lint prevLint = chk.setLint(lint);
-
+        chk.checkModuleName(tree);
         chk.checkDeprecatedAnnotation(tree, msym);
 
         try {
             deferredLintHandler.flush(tree.pos());
         } finally {