Hello,
the function 'debug.getinfo' was removed?
The following code:
----
\startluacode
print(debug.getinfo)
\stopluacode
\starttext
A \cldcontext{tostring(debug.getinfo)}
\stoptext
----
gives/prints 'nil'.
IIRC, the function was non-nil some weeks ago...
Best regards,
Lukas