string "tester builtin functions"]:391: bad argument #2 to 'format' (string expected, got nil)
stack traceback:
        [C]: in function 'format'
        [string "tester builtin functions"]:391: in function 'samelines'
        ...rivate/net.venge.monotone/tests/common/selectors.lua:4: in function 'selmap'
        ...one/tests/b_t_and_a_selector_globbing/__driver__.lua:39: in main chunk
        [C]: in function 'xpcall'
        [string "tester builtin functions"]:867: in function 'runtest'
        [string "tester builtin functions"]:966: in function <[string "tester builtin functions"]:760>