17.6.4.2 The SLIME REPL

SLIME uses a custom Read-Eval-Print Loop (REPL). The REPL user-interface is written in Emacs Lisp, which gives more Emacs-integration than the traditional comint-based Lisp interaction:

• Conditions signalled in REPL expressions are debugged with SLDB.
• Return values are distinguished from printed output by separate Emacs faces (colours).
• Emacs manages the REPL prompt with markers. This ensures that Lisp output is inserted in the right place, and doesn’t get mixed up with user input.

Load the REPL:

(add-to-list 'slime-contribs 'slime-repl)

Select the output buffer, preferably in a different window.

M-x slime-switch-to-output-buffer (C-c C-z)

Insert a call to the function defined around point into the REPL.

M-x slime-call-defun (C-c C-y)

Inserts the last expression to the REPL and evaluates it there.

M-x slime-eval-last-expression-in-repl (C-c C-j)