The current v5-10 branch fails in gnus-convert-old-newsrc with this
error message:
Wrong type argument: number-char-or-marker-p, "Gnus v5.10.6" 

I found the bug on line 2262. I assume 'gnus-version' should be
replaced with '(gnus-continuum-version)'.

2261:	  (while (and converters (< fcv (caar converters))
2262:		      (<= (caar converters) gnus-version))

Bye
Patric