macroexpansion (slime-expand-1) results in error

Luís Oliveira luismbo at
Fri Dec 11 14:33:44 UTC 2015

On Thu, Dec 10, 2015 at 8:02 PM, Mirko Vukovic <mirko.vukovic at> 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

Luís Oliveira

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