From f00e74ffc73f6ba6fe74fb7a26319770b8c3792c Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Thu, 14 Apr 2022 07:00:15 -0700
Subject: @let: allow trailing comma.

We allow forms like @let(x,) and @let(x, y=1,) with the
trailing comma. This is helpful for code generators and macros,
which can then treat temporary variables as comma-terminated
items.

* awkgram.y (let_var_list_opt): Add a production which matches a
trailing comma after let_var_list.

* test/let1.awk, test/let1.ok: Test cases.

* doc/gawkt.texi, doc/gawktexi.in:  Trailing comma documented.

* awkgram.c: Regenerated with Bison 3.8.
---
 test/let1.awk | 14 ++++++++++++++
 test/let1.ok  |  6 ++++++
 2 files changed, 20 insertions(+)

(limited to 'test')

diff --git a/test/let1.awk b/test/let1.awk
index 413b6e1e..268222df 100644
--- a/test/let1.awk
+++ b/test/let1.awk
@@ -157,3 +157,17 @@ BEGIN {
   @let (x = 1, y = 2) { print "b6", x, y }
   @let (x = 1, y = 2, z = 3) { print "b6", x, y, z }
 }
+
+function f6()
+{
+  @let (x = 1) { print "f6", x }
+  @let (x = 1, y = 2,) { print "f6", x, y }
+  @let (x = 1, y = 2, z = 3,) { print "f6", x, y, z }
+}
+
+BEGIN {
+  f6()
+  @let (x = 1) { print "b7", x }
+  @let (x = 1, y = 2,) { print "b7", x, y }
+  @let (x = 1, y = 2, z = 3,) { print "b7", x, y, z }
+}
diff --git a/test/let1.ok b/test/let1.ok
index f3336775..70de9024 100644
--- a/test/let1.ok
+++ b/test/let1.ok
@@ -9,3 +9,9 @@ f5 1 2 3
 b6 1
 b6 1 2
 b6 1 2 3
+f6 1
+f6 1 2
+f6 1 2 3
+b7 1
+b7 1 2
+b7 1 2 3
-- 
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