xscheme-yank
xscheme-yank is an interactive compiled Lisp function in `xscheme.el
'.
(xscheme-yank &optional ARG)
Insert the most recent expression at point.
With just C-U as argument, same but put point in front (and mark at end).
With argument n, reinsert the nth most recently sent expression.
See also the commands M-x xscheme-yank-pop and M-x xscheme-yank-push.