src/jdk/nashorn/internal/parser/Lexer.java

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@@ -1113,10 +1113,14 @@
 
                 type = FLOATING;
             }
         }
 
+        if (Character.isJavaIdentifierStart(ch0)) {
+            error(Lexer.message("missing.space.after.number"), type, position, 1);
+        }
+
         // Add number token.
         add(type, start);
     }
 
     /**