bitarray/map over bitarrays/map! for length 0 @test map!(⊻, b, b1, b2) == map!(((x, y)->begin #= /cache/build/tester-amdci5-13/julialang/julia-master/julia-9cd212b64c/share/julia/test/bitarray.jl:1497 =# x ⊻ y end), b, b1, b2) == broadcast(⊻, b1, b2) == broadcast(xor, b1, b2) == b