New :mandatory keyword in until/last clauses.

* match.c (mandatory_k): New keyword variable.
(h_coll, v_gather, v_collect): Implement :mandatory logic.
(syms_init): Initialize mandatory_k.

* parser.l (grammar): The UNTIL and LAST tokens must be
matched similarly to collect, without consuming the
closing parenthesis, allowing a list of items to be parsed
between the symbol and the closure, in the NESTED state.

* parser.y (gather_clause, collect_clause, elem,
repeat_parts_opt, rep_parts_opt): Adjust to new until/last
syntax. In the matching productions, the abstract syntax
changes to incorporate the options. In the output productions,
we throw an error if options are present.

* txr.1: Documented :mandatory for collect, coll and gather.

0 files changed, 0 insertions, 0 deletions