Emacs 27 支持任意大的整数

xuchunyang · 2019 年1 月 22 日 13:57

(list emacs-version (expt 10 100))
;; => ("26.1" 0)

(list emacs-version (expt 10 100))
;; => ("27.0.50" 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000)

github.com

emacs-mirror/emacs/blob/c580081578edf8663e80cd86a1b4de377be58dc1/etc/NEWS#L1207


      
          +++
          ** 'condition-case' now accepts 't' to match any error symbol.
          
          
+++
          ** New function 'proper-list-p'.
          Given a proper list as argument, this predicate returns its length;
          otherwise, it returns nil.  'format-proper-list-p' is now an obsolete
          alias for the new function.
          
          
+++
          ** Emacs Lisp integers can now be of arbitrary size.
          Emacs uses the GNU Multiple Precision (GMP) library to support
          integers whose size is too large to support natively.  The integers
          supported natively are known as "fixnums", while the larger ones are
          "bignums".  The new predicates 'bignump' and 'fixnump' can be used to
          distinguish between these two types of integers.
          
          
All the arithmetic, comparison, and logical (a.k.a. "bitwise")
          operations where bignums make sense now support both fixnums and
          bignums.  However, note that unlike fixnums, bignums will not compare
          equal with 'eq', you must use 'eql' instead.  (Numerical comparison