[aidenn0]

> - ah ok, for dates and times

local-time has its limits (e.g. Gregorian only), but it does everything listed in this chart

> flattening a list

What? Isn't this[1] just fine (<s>)

> hash-table literals…

Since the chart is sbcl specific, this ugly mess would technically count; a more portable (but longer) version could be made similarly using #.:

  #.(SB-IMPL::%STUFF-HASH-TABLE (MAKE-HASH-TABLE :TEST 'EQUAL) '((:X . :Y))) 

> java interop: with LispWorks or ABCL (or other libraries)

I've had good luck with .net/java interop using FOIL (written by Rich Hickey prior to Clojure).

1:

  CL-USER> (let* ((result (cons nil nil))
                 (tail result))
             (subst-if t
                       (constantly nil)
                       '(a ((b(c d)) e) f)
                       :key (lambda (x)
                              (when (and x (atom x)) (setf (cdr tail) (cons x   nil)
                                                           tail (cdr tail)))))
             (cdr result))

=> (A B C D E F)