If I use "Insert code..."->"Add Property..." from the context menu to generate code for a property and enter a keyword like "class" or "if" as the property's name there is no warning; generating the code is not prevented. But the resulting code is clearly invalid.
It would be nice to get a warning at least or prevent the code generation at all, especially since naming conflicts with class members are checked. (The behavior is somehow inconsistent, if some kinds of invalid names are checked and others not.)