New ignerr macro.

* eval.c (me_ignerr): New static function.
(eval_init): Registered ignerr macro.

* txr.1: Documented.

* tl.vim, txr.vim: Regenerated.

1 files changed, 30 insertions, 0 deletions

diff --git a/txr.1 b/txr.1
index 5c4d61c6..75794618 100644
--- a/txr.1
+++ b/txr.1
@@ -19657,6 +19657,36 @@ operator, and the functions
 and
 .codn error .
 
+.coNP Macro @ ignerr
+.synb
+.mets (ignerr << form *)
+.syne
+.desc
+The
+.code ignerr
+macro operator evaluates each
+.meta form
+similarly to the
+.code progn
+operator. If no forms are present, it returns
+.codn nil .
+Otherwise it evaluates each
+.meta form
+in turn, yielding the value of the last one.
+
+If the evaluation of any
+.meta form
+is abandoned due to an exception of type
+.codn error ,
+the code generated by the
+.code ignerr
+macro catches this exception. In this situation,
+the execution of the
+.code ignerr
+form terminates without evaluating the remaining
+forms, and yields
+.codn nil .
+
 .coNP Variable @ *unhandled-hook*
 
 The