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The current syntax for functions in `app` and `pred` patterns allows a shorthand (F ARGS) where the object being matched is added as an extra last argument. This is nice for things like (pred (< 5)) but sometimes the object needs to be at another position. Until now you had to use (pred (lambda (x) (memq x my-list))) or (pred (pcase--flip memq my-list)) in those cases. So, introduce a new shorthand where `_` can be used to indicate where the object should be passed: (pred (memq _ my-list)) * lisp/emacs-lisp/pcase.el (pcase--split-pred): Document new syntax for pred/app functions. (pcase--funcall): Support new syntax. (pcase--flip): Declare obsolete. (pcase--u1, \`): Use `_` instead. (pcase--split-pred): Adjust accordingly. * doc/lispref/control.texi (pcase Macro): Document new syntax for pred/app functions. * lisp/progmodes/opascal.el (pcase-defmacro): * lisp/emacs-lisp/seq.el (seq--make-pcase-bindings): * lisp/emacs-lisp/eieio.el (eieio): * lisp/emacs-lisp/cl-macs.el (cl-struct, cl-type): Use _ instead of `pcase--flip`. (cl--pcase-mutually-exclusive-p): Adjust accordingly. * lisp/emacs-lisp/map.el (map--pcase-map-elt): Declare obsolete. (map--make-pcase-bindings): Use `_` instead. |
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