Avoid regression in popdef(undef).

* doc/m4.texinfo (Trace): Enhance test, to cover regression
recently fixed on the branch.

Signed-off-by: Eric Blake <ebb9@byu.net>
(cherry picked from commit f35224878771517f1d7c13568c1b65a59e7908a4)

2 files changed, 17 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 85e876b7..acbdeec5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2009-02-11  Eric Blake  <ebb9@byu.net>
+
+	Avoid regression in popdef(undef).
+	* doc/m4.texinfo (Trace): Enhance test, to cover regression
+	recently fixed on the branch.
+
 2009-02-09  Eric Blake  <ebb9@byu.net>
 
 	Enhance index to support starting offset.
diff --git a/doc/m4.texinfo b/doc/m4.texinfo
index 093f3952..f972b48b 100644
--- a/doc/m4.texinfo
+++ b/doc/m4.texinfo
@@ -4238,6 +4238,16 @@ foo
 defn(`foo')
 @error{}m4:stdin:4: Warning: defn: undefined macro `foo'
 @result{}
+undefine(`foo')
+@error{}m4:stdin:5: Warning: undefine: undefined macro `foo'
+@result{}
+pushdef(`foo')
+@result{}
+popdef(`foo')
+@result{}
+popdef(`foo')
+@error{}m4:stdin:8: Warning: popdef: undefined macro `foo'
+@result{}
 define(`foo', `bar')
 @result{}
 foo
@@ -4248,7 +4258,7 @@ undefine(`foo')
 ifdef(`foo', `yes', `no')
 @result{}no
 indir(`foo')
-@error{}m4:stdin:9: Warning: indir: undefined macro `foo'
+@error{}m4:stdin:13: Warning: indir: undefined macro `foo'
 @result{}
 define(`foo', `blah')
 @result{}