From: Richard M. Stallman <rms@gnu.org>
Date: Sun, 5 Oct 2003 13:56:53 +0000 (+0000)
Subject: (Named Features): In `provide', say how to test for subfeatures.
X-Git-Tag: ttn-vms-21-2-B4~8621
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=0373c25e8746df2c09a9c058c7db0cdb7022c57e;p=emacs.git

(Named Features): In `provide', say how to test for subfeatures.
(Unloading): In unload-feature, use new var name
unload-feature-special-hooks.
---

diff --git a/lispref/loading.texi b/lispref/loading.texi
index 71ae09284a8..4f031c5146c 100644
--- a/lispref/loading.texi
+++ b/lispref/loading.texi
@@ -656,6 +656,7 @@ The argument @var{feature} must be a symbol.  @code{provide} returns
 
 If provided, @var{subfeatures} should be a list of symbols indicating
 a set of specific subfeatures provided by this version of @var{feature}.
+You can test the presence of a subfeature using @code{featurep}.
 
 @smallexample
 features
@@ -723,12 +724,14 @@ library with @code{defun}, @code{defalias}, @code{defsubst},
 It then restores any autoloads formerly associated with those symbols.
 (Loading saves these in the @code{autoload} property of the symbol.)
 
+@vindex unload-feature-special-hooks
 Before restoring the previous definitions, @code{unload-feature} runs
 @code{remove-hook} to remove functions in the library from certain
-hooks.  These hooks include variables whose names end in @samp{hook} or
-@samp{-hooks}, plus those listed in @code{loadhist-special-hooks}.  This
-is to prevent Emacs from ceasing to function because important hooks
-refer to functions that are no longer defined.
+hooks.  These hooks include variables whose names end in @samp{hook}
+or @samp{-hooks}, plus those listed in
+@code{unload-feature-special-hooks}.  This is to prevent Emacs from
+ceasing to function because important hooks refer to functions that
+are no longer defined.
 
 @vindex @var{feature}-unload-hook
 If these measures are not sufficient to prevent malfunction, a library