Hi Thorsten,

> > I'm a bit puzzled by this question. To my understanding, every possible
> > expression in PicoLisp is a SEXP. Even auto-quoting expressions like
> ...
> .. and was a bit confused when asking, I probably meant 'list' instead of
> SEXP. 
> ...
> then invalid file names fall into category 'elisp expressions' and cause
> errors later on. But its probably better to check the expressions of the
> elisp side and this question is kind of obsolete, but thanks anyway. 

In general, there is no way to detect statically whether an s-expression
is executable or not. Something like (a b c d) may not be executable
*now*, because 'a' is not a function, but it may be shortly after.

♪♫ Alex
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