macro
/usr/local/lib/janet/spork/misc.janet on line 216, column 1
(log level & args)
Print to a dynamic binding stream if that stream is set, otherwise
do nothing. Evaluate to nil. For example, `(log :err "value error:
%V" my-value)` will print to `(dyn :err)` only if `(dyn :err)` has
been set.