The TYPEDEF and SAME AS clauses are currently not in parser.y, reserved.c has TYPEDEF as "not-implemented".
The 2002 rules for TYPEDEF seem to be even more lax than microfocus in some parts (but not enough to create special compiler configuration flags for this).
SAME AS will likely need a compiler configuration flag as different stds defines these words but don't support the SAME AS clause.
As always: adding parsing only would be a first step. Implementing it (especially for group-items) is likely harder.
See also [feature-requests:#193].
Related
Wish List: #193
Closed in favor of [feature-requests:#193] (I've obviously searched and created the FR in the wrong (bugs) section.
Thank you Edward for pointing this out.
Related
Wish List: #193