include pmaths.e -- (needed pre-0.8.1 to work around a compiler bug [oops])
--include complex.e -- (not an auto-include, needed in all versions)
integer r_abs = routine_id("abs")
--integer r_abs = routine_id("complex_abs")
if r_abs!=-1 then
    ?call_func(r_abs,{-42})
end if