Cannot use view() on A_mul_B!

[biona001]

Since A_mul_B accepts SnpLike{2} for the matrix argument, I thought I could use view() to do multiplication on just a subset of my snparray. However the following shows this cannot be done.

S = SnpArray(rand(0:2, 10, 10))
b = rand(5)
answer = zeros(5)

Do multiplication on the top left corner:

julia> A_mul_B!(answer, view(S, 1:5, 1:5), b, similar(answer))
ERROR: type SubArray has no field A1
Stacktrace:
 [1] A_mul_B!(::Array{Float64,1}, ::SubArray{Tuple{Bool,Bool},2,SnpArrays.SnpArray{2},Tuple{UnitRange{Int64},UnitRange{Int64}},false}, ::Array{Float64,1}, ::Array{Float64,1}) at /Users/biona001/.julia/v0.6/SnpArrays/src/SnpArrays.jl:728

edit:
Adding example to show that A_mul_B! works on subarrays without loading packages:

x = rand(10, 10)
b = rand(5)
answer = zeros(5)

julia> A_mul_B!(answer, view(x, 1:5, 1:5), b)
5-element Array{Float64,1}:
 1.59663
 1.19226
 1.17276
 0.675278
 1.56565