(local forms [{:id :1234
                :aliases [:container]
                :additive-conditions [
                :acts [:receive :remove]
                :contents []
                :receive [:fn [:self :item]
                          [:call :foo](:call-:foo.md)]
                :remove [:fn [:self :item :?destination]
                         [:call :foo](:call-:foo.md)]},
                {:id :4321
                 :aliases [:backpack]
                 :bases [:container]
                 :acts ])

: unknown:5:33: Parse error: expected whitespace before opening delimiter [ : : * Try adding whitespace.