bitarray/map over bitarrays/map! for length 0 @test map!(max, b, b1, b2) == map!(((x, y)->begin #= /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-master/julia-41d5e6cd71/share/julia/test/bitarray.jl:1503 =# max(x, y) end), b, b1, b2) == max.(b1, b2) == b