Deprecate copy-record in favor of copy-sequence

Since copy-sequence seems to be needed anyway for records, have it
work on records, and remove copy-record as being superfluous.
* doc/lispref/records.texi (Records, Record Functions):
* lisp/emacs-lisp/cl-macs.el (cl-defstruct):
* lisp/emacs-lisp/eieio.el (make-instance, clone):
* test/src/alloc-tests.el (record-3):
Use copy-sequence, not copy-record, to copy records.
* doc/lispref/sequences.texi (Sequence Functions)
(Array Functions): Document that aref and copy-sequence
work on records.
* etc/NEWS: Omit copy-record.
* src/alloc.c (Fcopy_record): Remove.
* src/data.c (Faref): Document that arg can be a record.
* src/fns.c (Fcopy_sequence): Copy records, too.

9 files changed, 33 insertions, 74 deletions

diff --git a/doc/lispref/records.texi b/doc/lispref/records.texi
index 2533a8a4ca1..7cc36f14068 100644
--- a/doc/lispref/records.texi
+++ b/doc/lispref/records.texi
@@ -13,8 +13,9 @@ underlying representation of @code{cl-defstruct} and @code{defclass}
 instances.
 
   Internally, a record object is much like a vector; its slots can be
-accessed using @code{aref}.  However, the first slot is used to hold
-its type as returned by @code{type-of}.  Also, in the current
+accessed using @code{aref} and it can be copied using
+@code{copy-sequence}.  However, the first slot is used to hold its
+type as returned by @code{type-of}.  Also, in the current
 implementation records can have at most 4096 slots, whereas vectors
 can be much larger.  Like arrays, records use zero-origin indexing:
 the first slot has index 0.
@@ -74,38 +75,6 @@ This function returns a new record with type @var{type} and
 @end example
 @end defun
 
-@defun copy-record record
-This function returns a shallow copy of @var{record}.  The copy is the
-same type as the original record, and it has the same slots in the
-same order.
-
-  Storing a new slot into the copy does not affect the original
-@var{record}, and vice versa.  However, the slots of the new record
-are not copies; they are identical (@code{eq}) to the slots of the
-original.  Therefore, changes made within these slots, as found via
-the copied record, are also visible in the original record.
-
-@example
-@group
-(setq x (record 'foo 1 2))
-     @result{} #s(foo 1 2)
-@end group
-@group
-(setq y (copy-record x))
-     @result{} #s(foo 1 2)
-@end group
-
-@group
-(eq x y)
-     @result{} nil
-@end group
-@group
-(equal x y)
-     @result{} t
-@end group
-@end example
-@end defun
-
 @node Backward Compatibility
 @section Backward Compatibility
 
diff --git a/doc/lispref/sequences.texi b/doc/lispref/sequences.texi
index 2c88ee38cb1..93e8fa8a5fa 100644
--- a/doc/lispref/sequences.texi
+++ b/doc/lispref/sequences.texi
@@ -151,20 +151,19 @@ This function generalizes @code{aref} (@pxref{Array Functions}) and
 @code{nth} (@pxref{Definition of nth}).
 @end defun
 
-@defun copy-sequence sequence
+@defun copy-sequence seqr
 @cindex copying sequences
-This function returns a copy of @var{sequence}.  The copy is the same
-type of object as the original sequence, and it has the same elements
-in the same order.
+This function returns a copy of @var{seqr}, which should be either a
+sequence or a record.  The copy is the same type of object as the
+original, and it has the same elements in the same order.
 
 Storing a new element into the copy does not affect the original
-@var{sequence}, and vice versa.  However, the elements of the new
-sequence are not copies; they are identical (@code{eq}) to the elements
+@var{seqr}, and vice versa.  However, the elements of the copy
+are not copies; they are identical (@code{eq}) to the elements
 of the original.  Therefore, changes made within these elements, as
-found via the copied sequence, are also visible in the original
-sequence.
+found via the copy, are also visible in the original.
 
-If the sequence is a string with text properties, the property list in
+If the argument is a string with text properties, the property list in
 the copy is itself a copy, not shared with the original's property
 list.  However, the actual values of the properties are shared.
 @xref{Text Properties}.
@@ -1148,10 +1147,10 @@ vector, a string, a bool-vector or a char-table).
 @end example
 @end defun
 
-@defun aref array index
+@defun aref arr index
 @cindex array elements
-This function returns the @var{index}th element of @var{array}.  The
-first element is at index zero.
+This function returns the @var{index}th element of the array or record
+@var{arr}.  The first element is at index zero.
 
 @example
 @group
diff --git a/etc/NEWS b/etc/NEWS
index aaca229d5cd..e351abc159f 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -863,9 +863,9 @@ instead of its first.
 
 +++
 ** Emacs now supports records for user-defined types, via the new
-functions 'copy-record', 'make-record', 'record', and 'recordp'.
-Records are now used internally to represent cl-defstruct and defclass
-instances, for example.
+functions 'make-record', 'record', and 'recordp'.  Records are now
+used internally to represent cl-defstruct and defclass instances, for
+example.
 
 +++
 ** 'save-some-buffers' now uses 'save-some-buffers-default-predicate'
diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 25c9f999920..ecb89fd51d7 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -2808,8 +2808,7 @@ non-nil value, that slot cannot be set via `setf'.
     (setq slots (nreverse slots)
           defaults (nreverse defaults))
     (and copier
-         (push `(defalias ',copier
-                    ,(if (null type) '#'copy-record '#'copy-sequence))
+         (push `(defalias ',copier #'copy-sequence)
                forms))
     (if constructor
         (push (list constructor
diff --git a/lisp/emacs-lisp/eieio.el b/lisp/emacs-lisp/eieio.el
index 858b2fdaa04..e21d46e5289 100644
--- a/lisp/emacs-lisp/eieio.el
+++ b/lisp/emacs-lisp/eieio.el
@@ -699,8 +699,8 @@ SLOTS are the initialization slots used by `initialize-instance'.
 This static method is called when an object is constructed.
 It allocates the vector used to represent an EIEIO object, and then
 calls `initialize-instance' on that object."
-  (let* ((new-object (copy-record (eieio--class-default-object-cache
-                                   (eieio--class-object class)))))
+  (let* ((new-object (copy-sequence (eieio--class-default-object-cache
+                                     (eieio--class-object class)))))
     (if (and slots
              (let ((x (car slots)))
                (or (stringp x) (null x))))
@@ -804,7 +804,7 @@ first and modify the returned object.")
 
 (cl-defmethod clone ((obj eieio-default-superclass) &rest params)
   "Make a copy of OBJ, and then apply PARAMS."
-  (let ((nobj (copy-record obj)))
+  (let ((nobj (copy-sequence obj)))
     (if (stringp (car params))
         (funcall (if eieio-backward-compatibility #'ignore #'message)
                  "Obsolete name %S passed to clone" (pop params)))
diff --git a/src/alloc.c b/src/alloc.c
index fad84b8a0b3..88a1a1ed660 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -3440,19 +3440,6 @@ usage: (record TYPE &rest SLOTS) */)
 }
 
 
-DEFUN ("copy-record", Fcopy_record, Scopy_record, 1, 1, 0,
-       doc: /* Return a new record that is a shallow copy of the argument RECORD.  */)
-  (Lisp_Object record)
-{
-  CHECK_RECORD (record);
-  ptrdiff_t size = ASIZE (record) & PSEUDOVECTOR_SIZE_MASK;
-  struct Lisp_Vector *new = allocate_record (size);
-  memcpy (new->contents, XVECTOR (record)->contents,
-          size * sizeof (Lisp_Object));
-  return make_lisp_ptr (new, Lisp_Vectorlike);
-}
-
-
 DEFUN ("make-vector", Fmake_vector, Smake_vector, 2, 2, 0,
        doc: /* Return a newly created vector of length LENGTH, with each element being INIT.
 See also the function `vector'.  */)
@@ -7523,7 +7510,6 @@ The time is in seconds as a floating point value.  */);
   defsubr (&Slist);
   defsubr (&Svector);
   defsubr (&Srecord);
-  defsubr (&Scopy_record);
   defsubr (&Sbool_vector);
   defsubr (&Smake_byte_code);
   defsubr (&Smake_list);
diff --git a/src/data.c b/src/data.c
index 3ffca54658d..903e809d235 100644
--- a/src/data.c
+++ b/src/data.c
@@ -2266,8 +2266,8 @@ function chain of symbols.  */)
 /* Extract and set vector and string elements.  */
 
 DEFUN ("aref", Faref, Saref, 2, 2, 0,
-       doc: /* Return the element of ARRAY at index IDX.
-ARRAY may be a vector, a string, a char-table, a bool-vector,
+       doc: /* Return the element of ARG at index IDX.
+ARG may be a vector, a string, a char-table, a bool-vector, a record,
 or a byte-code object.  IDX starts at 0.  */)
   (register Lisp_Object array, Lisp_Object idx)
 {
diff --git a/src/fns.c b/src/fns.c
index 47da5f8b4bc..2f07c2ccfb7 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -475,13 +475,19 @@ usage: (vconcat &rest SEQUENCES)   */)
 
 
 DEFUN ("copy-sequence", Fcopy_sequence, Scopy_sequence, 1, 1, 0,
-       doc: /* Return a copy of a list, vector, string or char-table.
-The elements of a list or vector are not copied; they are shared
-with the original.  */)
+       doc: /* Return a copy of a list, vector, string, char-table or record.
+The elements of a list, vector or record are not copied; they are
+shared with the original.  */)
   (Lisp_Object arg)
 {
   if (NILP (arg)) return arg;
 
+  if (RECORDP (arg))
+    {
+      ptrdiff_t size = ASIZE (arg) & PSEUDOVECTOR_SIZE_MASK;
+      return Frecord (size, XVECTOR (arg)->contents);
+    }
+
   if (CHAR_TABLE_P (arg))
     {
       return copy_char_table (arg);
diff --git a/test/src/alloc-tests.el b/test/src/alloc-tests.el
index 8b4ef8ce7d2..1cf1fc3be5c 100644
--- a/test/src/alloc-tests.el
+++ b/test/src/alloc-tests.el
@@ -47,7 +47,7 @@
 
 (ert-deftest record-3 ()
   (let* ((x (record 'foo 1 2 3))
-         (y (copy-record x)))
+         (y (copy-sequence x)))
     (should-not (eq x y))
     (dotimes (i 4)
       (should (eql (aref x i) (aref y i))))))