[SCM] GNU Autoconf source repository branch, master, updated. v2.62-23-g95dfc19

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 95dfc197494a66dc9a88577d18f1633afc7cff2d
Author: Eric Blake <address@hidden>
Date:   Wed May 14 13:41:18 2008 -0600

    Improve documentation of ! issues.
    
    * doc/autoconf.texi (Limitations of Builtins) <!>: Touch up.
    Reported by Noah Misch.
    
    Signed-off-by: Eric Blake <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog         |    4 ++++
 doc/autoconf.texi |   12 +++++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 3782a5b..15adde0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2008-05-14  Eric Blake  <address@hidden>
 
+       Improve documentation of ! issues.
+       * doc/autoconf.texi (Limitations of Builtins) <!>: Touch up.
+       Reported by Noah Misch.
+
        Document some FreeBSD shell bugs.
        * doc/autoconf.texi (Limitations of Builtins) <!>: Mention ! issue
        in compound pipe commands.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index fd60b7b..ee1ede5 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -13776,13 +13776,19 @@ The Unix version 7 shell did not support
 negating the exit status of commands with @command{!}, and this feature
 is still absent from some shells (e.g., Solaris @command{/bin/sh}).
 Other shells, such as FreeBSD @command{/bin/sh} or @command{ash}, have
-bugs when using @command{!} in compound commands:
+bugs when using @command{!}:
 
 @example
-$ @kbd{sh -c 'true && ! true | true; echo $?'}
+$ @kbd{sh -c '! : | :'; echo $?}
 1
-$ @kbd{ash -c 'true && ! true | true; echo $?'}
+$ @kbd{ash -c '! : | :'; echo $?}
 0
+$ @kbd{sh -c '! @{ :; @}'; echo $?}
+1
+$ @kbd{ash -c '! @{ :; @}'; echo $?}
address@hidden: not found
+Syntax error: "@}" unexpected
+2
 @end example
 
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