Minor simplifications and doc for records

* doc/lispref/records.texi (Records): Mention size limit.
* etc/NEWS: Mention records.
* src/alloc.c (allocate_pseudovector, allocate_record):
Prefer 'PSEUDOVECTOR_SIZE_MASK' to its definiens.
(allocate_record): Check arg range here, not in callers, as this
simplifies the code.  Use allocate_vectorlike instead of
allocate_vector, to avoid duplicate runtime tests.
(Fmake_record, record): Don't mention PSEUDOVECTOR_SIZE_BITS in
the doc string, as it is not visible to the user.
(Fmake_record, record, Fcopy_record):
Prefer make_lisp_ptr to XSETVECTOR.
(record): Broaden memcpy to copy the type, too.

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index fc076569862..8b17f1648bf 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -840,6 +840,12 @@ instead of its first.
 * Lisp Changes in Emacs 26.1
 
 +++
+** 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.
+
++++
 ** 'save-some-buffers' now uses 'save-some-buffers-default-predicate'
 to decide which buffers to ask about, if the PRED argument is nil.
 The default value of 'save-some-buffers-default-predicate' is nil,