master d41a4ad: * lisp/emacs-lisp/macroexp.el (macroexp--expand-all): Warn on empty let bodies

[Stefan Monnier]

branch: master
commit d41a4ad4ae6f25c3cbc90aaaa33781821bb655c5
Author: Stefan Monnier <monnier@iro.umontreal.ca>
Commit: Stefan Monnier <monnier@iro.umontreal.ca>

    * lisp/emacs-lisp/macroexp.el (macroexp--expand-all): Warn on empty let 
bodies
---
 lisp/emacs-lisp/macroexp.el | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lisp/emacs-lisp/macroexp.el b/lisp/emacs-lisp/macroexp.el
index 13ff5ef..0934e43 100644
--- a/lisp/emacs-lisp/macroexp.el
+++ b/lisp/emacs-lisp/macroexp.el
@@ -299,7 +299,12 @@ Assumes the caller has bound 
`macroexpand-all-environment'."
       (`(,(and fun (or 'let 'let*)) . ,(or `(,bindings . ,body) dontcare))
        (macroexp--cons fun
                        (macroexp--cons (macroexp--all-clauses bindings 1)
-                                       (macroexp--all-forms body)
+                                       (if (null body)
+                                           (macroexp-unprogn
+                                            (macroexp--warn-and-return
+                                             (format "Empty %s body" fun)
+                                             nil t))
+                                         (macroexp--all-forms body))
                                        (cdr form))
                        form))
       (`(,(and fun `(lambda . ,_)) . ,args)