Automagical annotation of lisp values like Ruby's xmpfilter. For example, executing M-x lispxmp on the following buffer: ==== 1 ; => (+ 3 4) ; => (dotimes (i 3) (* i 4) ; => ) ==== produces ==== 1 ; => 1 (+ 3 4) ; => 7 (dotimes (i 3) (* i 4) ; => 0, 4, 8 ) ====