<verbatim>
 mtutil run -area ext-tests -target

Error: (null-list?) bad argument type - not a list: #<hash-table (2)>

        Call history:

        configf.scm:50: hash-table-ref/default
        configf.scm:49: config:assoc-safe-add
        configf.scm:41: ##sys#get-keyword
        configf.scm:42: filter
        configf.scm:43: append
        configf.scm:48: hash-table-set!
        mtut.scm:843: configf:lookup
        configf.scm:416: hash-table?
        configf.scm:417: hash-table-ref/default
        mtut.scm:844: string-split
        mtut.scm:845: hash-table-copy
        mtut.scm:841: ##sys#call-with-values
        mtut.scm:852: command-line->pkt
        mtut.scm:392: current-seconds
        mtut.scm:397: current-user-name
        mtut.scm:410: filter            <--
</verbatim>