Re: macroexpansion (slime-expand-1) results in error

On Thu, Dec 10, 2015 at 8:02 PM, Mirko Vukovic mirko.vukovic@gmail.com wrote:

10: (SWANK:EVAL-FOR-EMACS (SWANK:SWANK-EXPAND-1 NIL) "#:display-it" 65)

As Stas had anticipated, this happens when there's no s-exp starting where the cursor (or point in Emacs-speak) is and slime-sexp-at-point returns NIL, but swank-expand-1 is expecting a string. You must place the cursor on the opening parenthesis.

Perhaps slime-expand-1 could be more DWIM-ish and try harder to find a s-exp to macro expand, but certainly signalling a CL TYPE-ERROR is unfortunate. As Stas mentioned, this error has been in SLIME for a very long time. I have a fix to avoid the error that I'll push shortly.