segfault on producing an action for a non terminal without type

[zosrothko]

Hi

Compilation of the below snippet by btyacc fails with a segfault because the non terminal RootComponentTypeList has no declared type.

%union {
char* tval;
char* tlist;
}
%type <tval> ComponentTypeLists
%type <tlst> ComponentTypeList

%%
ComponentTypeLists
    : RootComponentTypeList {
        $$ = new SequenceType($1, false, nullptr); 
    }
;
RootComponentTypeList
    : ComponentTypeList
;