Edebug: Make it possible to debug `gv-expander`s in `declare`

Arrange for declarations to be able to specify their own specs via
the `edebug-declaration-spec` property.

* lisp/emacs-lisp/edebug.el: (edebug--get-declare-spec): New function.
(def-declarations): New spec element.
(defun, defmacro): Use it in their spec.

* lisp/emacs-lisp/gv.el (gv-expander, gv-setter):
Set `edebug-declaration-spec`.

* test/lisp/emacs-lisp/edebug-tests.el (edebug-tests-gv-expander): New test.

* test/lisp/emacs-lisp/edebug-resources/edebug-test-code.el
(edebug-test-code-use-gv-expander): New test case.

2 files changed, 13 insertions, 4 deletions

diff --git a/lisp/emacs-lisp/edebug.el b/lisp/emacs-lisp/edebug.el
index 47b45614e71..394f47090ca 100644
--- a/lisp/emacs-lisp/edebug.el
+++ b/lisp/emacs-lisp/edebug.el
@@ -2207,14 +2207,12 @@ into `edebug--cl-macrolet-defs' which is checked in `edebug-list-form-args'."
        ;; `defun' and `defmacro' are not special forms (any more), but it's
        ;; more convenient to define their Edebug spec here.
        (defun ( &define name lambda-list lambda-doc
-                [&optional ("declare" &rest sexp)]
+                [&optional ("declare" def-declarations)]
                 [&optional ("interactive" &optional &or stringp def-form)]
                 def-body))
 
-       ;; FIXME: Improve `declare' so we can Edebug gv-expander and
-       ;; gv-setter declarations.
        (defmacro ( &define name lambda-list lambda-doc
-                   [&optional ("declare" &rest sexp)]
+                   [&optional ("declare" def-declarations)]
                    def-body))
 
        ;; function expects a symbol or a lambda or macro expression
@@ -2243,6 +2241,12 @@ into `edebug--cl-macrolet-defs' which is checked in `edebug-list-form-args'."
        ))
     (put name 'edebug-form-spec spec))
 
+(defun edebug--get-declare-spec (head)
+  (get head 'edebug-declaration-spec))
+
+(def-edebug-elem-spec 'def-declarations
+  '(&rest &or (&lookup symbolp edebug--get-declare-spec) sexp))
+
 (def-edebug-elem-spec 'lambda-list
   '(([&rest arg]
      [&optional ["&optional" arg &rest arg]]
diff --git a/lisp/emacs-lisp/gv.el b/lisp/emacs-lisp/gv.el
index c160aa1fd35..edacdf7f0c8 100644
--- a/lisp/emacs-lisp/gv.el
+++ b/lisp/emacs-lisp/gv.el
@@ -187,6 +187,11 @@ arguments as NAME.  DO is a function as defined in `gv-get'."
     (push (list 'gv-setter #'gv--setter-defun-declaration)
           defun-declarations-alist))
 
+;;;###autoload
+(let ((spec '(&or symbolp ("lambda" &define lambda-list def-body))))
+  (put 'gv-expander 'edebug-declaration-spec spec)
+  (put 'gv-setter 'edebug-declaration-spec spec))
+
 ;; (defmacro gv-define-expand (name expander)
 ;;   "Use EXPANDER to handle NAME as a generalized var.
 ;; NAME is a symbol: the name of a function, macro, or special form.