New catch*, giving access to exception symbol.

* eval.c (op_catch): The sys:catch operator now passes the
exception symbol as the first argument of each clause.
This means the catch macro must be adjusted.

* share/txr/stdlib/except.tl (catch): Macro now inserts
a gensym dummy first argument into each clause to take the
symbol passed by the sys:catch operator.
(catch*): New macro, which is identical to the previous
catch macro, and thus exposes the symbol passed as the
first argument.

* txr.1: Documented catch*.

* tests/012/struct.tl: Some gensym numbers need adjusting
in one test case.

0 files changed, 0 insertions, 0 deletions