This also includes changes to if-let and when-let. The single tuple special case is ambiguous, and binding a symbol to nil is not as useful as binding it to its value outside the lexical scope of the binding. (Bug#28254) * etc/NEWS: Mention. * lisp/emacs-lisp/subr-x.el (internal--listify): (internal--build-binding-value-form): Extend to account for solitary symbols and (EXPR) items in binding varlist. (if-let*, when-let*): Nix single tuple case and incumbent bind-symbol-to-nil behavior. (and-let*): New macro. (if-let, when-let): Mark obsolete. Redefine in terms of if-let*, so they implicitly gain the new features without breaking existing code. * test/lisp/emacs-lisp/subr-x-tests.el: Adjust tests for: lack of single-tuple special case, lack of binding solitary symbols to nil, and the introduction of uninterned symbols for (EXPR) bindings. Add SRFI-2 test suite adapted to Elisp.
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