Fix bug #12138 with indexing "closures".

 doc/lispref/functions.texi (Closures): Put the main index entry for
 "closures" here.
 doc/lispref/variables.texi (Lexical Binding): Disambiguate the index entry
 for "closures".

1 files changed, 2 insertions, 1 deletions

diff --git a/doc/lispref/functions.texi b/doc/lispref/functions.texi
index 5958d56686d..f1ad252f294 100644
--- a/doc/lispref/functions.texi
+++ b/doc/lispref/functions.texi
@@ -1115,8 +1115,9 @@ named function that you create (e.g.@: with @code{defun}), as well as
 any anonymous function that you create using the @code{lambda} macro
 or the @code{function} special form or the @code{#'} syntax
 (@pxref{Anonymous Functions}), is automatically converted into a
-closure.
+@dfn{closure}.
 
+@cindex closures
   A closure is a function that also carries a record of the lexical
 environment that existed when the function was defined.  When it is
 invoked, any lexical variable references within its definition use the