[Sbcl-devel] False compiler note "deleting unreachable code" with Slime

[Teemu L. <tli...@ik...>]

I get false compiler note "deleting unreachable code" on Slime when I
compile the following function in Emacs buffer with C-c C-c
(slime-compile-defun).

    (defun foo (thing)
      (setf thing (mapcar #'identity thing))
      (sort thing #'string-lessp))

The (sort ...) expression is underlined, meaning it is "unreachable".
Yet, the sorting works. If I remove the (setf thing (mapcar ...))
expression the compiler note goes away. I'm using SBCL 1.1.8.30-51bc001
on Linux 3.2.0-4-amd64.

(I understand that this FOO function doesn't make entirely sense. It's
just mimized version of code I noticed in my program.)