Make `old-style-backquotes' variable internal

* src/lread.c (load_warn_old_style_backquotes, Fload, read1)
(syms_of_lread): Rename `old-style-backquotes' to
`lread--old-style-backquotes', and clarify that it's for internal
use only.
* lisp/emacs-lisp/bytecomp.el (byte-compile-from-buffer): Rename
variable.
* test/src/lread-tests.el (lread-tests--old-style-backquotes): Add
unit test.
* emacs-lisp/bytecomp-tests.el
(bytecomp-tests--old-style-backquotes): Add unit test.

1 files changed, 5 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 9be6ee0f3f7..380ce710130 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -907,6 +907,11 @@ which was sometimes numerically incorrect.  For example, on a 64-bit
 host (max 1e16 10000000000000001) now returns its second argument
 instead of its first.
 
++++
+** The variable 'old-style-backquotes' has been made internal and
+renamed to 'lread--old-style-backquotes'.  No user code should use
+this variable.
+
 
 * Lisp Changes in Emacs 26.1