Mapslices() warntype?

@tomtom wrote:

I’m wondered seeing that mapslices() gives warntype as below:

julia> const mat = randn(3,2)
3×2 Array{Float64,2}:
  1.49498   -1.98461  
 -0.935659  -0.0317199
  0.783414  -0.284129 

julia> mapslices(prod, mat, dims = 1)
1×2 Array{Float64,2}:
 -1.09583  -0.0178864

julia> @code_warntype mapslices(prod, mat, dims = 1)
Body::Any
...
5 ┄ %16 = Base.:(var"#mapslices#109")(dims, @_3, f, A)::Any
└──       return %16

is there any way to avoid the warntype? thanks.

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