Created attachment 154732 [details]
Sample code to trigger misbehaviour with bad names "for" generics.

In Genie, for

class Thing of object : Object

I get an compiler error that is not clear in what the underlying problem is.


If I use

class InsaneThing of _object_ : Object

I get an error at runtim:
GLib-GObject-CRITICAL **: g_param_spec_internal: assertion `(name[0] >= 'A' && name[0] <= 'Z') || (name[0] >= 'a' && name[0] <= 'z')' failed
Segmentation fault.*/


I imagine that valac should either emit a proper warning here.
Sample code is attached.