ECHO: "returning true"
ECHO: true
ECHO: true
ECHO: true
ECHO: true
ECHO: true
ECHO: "--------"
ECHO: "returning false"
ECHO: false
ECHO: false
ECHO: false
ECHO: false
ECHO: false
ECHO: false
ECHO: "--------"
ECHO: "causing warnings:"
WARNING: is_list() number of parameters does not match, in file islist-test.scad, line 17
ECHO: undef
WARNING: is_list() number of parameters does not match, in file islist-test.scad, line 18
ECHO: undef
