Thanks for reporting that. I installed this patch.
2005-12-29 Paul Eggert <eggert@xxxxxxxxxxx>
* doc/autoconf.texi (Shell Substitutions): Warn about unbalanced
parentheses in $(...). Problem reported by Eric Blake.
--- doc/autoconf.texi 12 Dec 2005 18:46:51 -0000 1.936
+++ doc/autoconf.texi 29 Dec 2005 21:28:30 -0000 1.937
@@ -10511,6 +10511,15 @@ a different notation @samp{$((@var{expre
shells is an arithmetic expression not a command. To avoid the
confusion, insert a space between the two opening parentheses.
+Avoid @var{commands} that contain unbalanced parentheses in
+here-documents, comments, or case statement patterns, as many shells
+mishandle them. For example, Bash 3.1, @samp{ksh88}, @command{pdksh}
+5.2.14, and Zsh 4.2.6 all mishandle the following valid command:
+
+@example
+echo $(case x in x) echo hello;; esac)
+@end example
+
@end table
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