#3880 listofvars([taylor(..),1]) gives an error when listdummyvars=false

[Neil Strickland]

I am using wxMaxima 21.05.2 (Windows 10 (build 19043), 64 bit edition). If I open a new worksheet and enter

listdummyvars:false;
listofvars([taylor(1/(1-x),x,0,1),1]);

then I get

Maxima encountered a Lisp error:
 The value
   #:X442
 is not of type
   LIST
Automatically continuing.
To enable the Lisp debugger set *debugger-hook* to nil.

I don't know how to use the Lisp debugger, so I haven't tried that.

[Neil Strickland]

The relevant code seems to be at line 33 of https://sourceforge.net/p/maxima/code/ci/master/tree/src/inmis.lisp and line 1396 of https://sourceforge.net/p/maxima/code/ci/master/tree/src/combin.lisp, but I have not understood it.