Define if-let* and derivatives as aliases for if-let etc

This commit reverts declaring `if-let' and `when-let' obsolete in
favor of the new `if-let*' and `when-let*' versions because of the
compiler warning mess (Bug#30039).  Instead we make foo-let* aliases
for foo-let.  The old single-tuple variable spec case is still
supported for backward compatibility.
* lisp/emacs-lisp/subr-x.el (if-let, when-let): Don't declare
obsolete.  Tweak edebug specs.
(and-let): Renamed from `and-let*' for compatibility with the names
`if-let' and `when-let'.
(if-let*, when-let*, and-let*): Define as aliases for `if-let',
`when-let' and `and-let'.
* test/lisp/emacs-lisp/subr-x-tests.el (if-let-single-tuple-case-test)
(when-let-single-tuple-case-test): New tests for the single-binding
tuple case.
In the whole file, prefer the names without "*".

1 files changed, 4 insertions, 6 deletions

diff --git a/etc/NEWS b/etc/NEWS
index eded00e6554..c88bec5a567 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1301,12 +1301,10 @@ current buffer or the self-insertion takes place within a comment.
 ** The alist 'ucs-names' is now a hash table.
 
 ---
-** 'if-let' and 'when-let' are subsumed by 'if-let*' and 'when-let*'.
-The incumbent 'if-let' and 'when-let' are now marked obsolete.
-'if-let*' and 'when-let*' do not accept the single tuple special case.
-New macro 'and-let*' is an implementation of the Scheme SRFI-2 syntax
-of the same name.  'if-let*' and 'when-let*' now accept the same
-binding syntax as 'and-let*'.
+** The new macro 'and-let' is an implementation of the Scheme SRFI-2
+syntax.  'if-let' and 'when-let' now also accept the same binding
+syntax as 'and-let'.  'if-let*', 'when-let*' and 'and-let*' are new
+aliases for 'if-let', 'when-let' and 'and-let'.
 
 ---
 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term