```
```
- ## primitive Array constructors
- struct UndefInitializer end
- const undef = UndefInitializer()
- # type and dimensionality specified, accepting dims as series of Ints
- Array{T,1}(::UndefInitializer, m::Int) where {T} =
- ccall(:jl_alloc_array_1d, Array{T,1}, (Any, Int), Array{T,1}, m)
- Array{T,2}(::UndefInitializer, m::Int, n::Int) where {T} =
- ccall(:jl_alloc_array_2d, Array{T,2}, (Any, Int, Int), Array{T,2}, m, n)
- Array{T,3}(::UndefInitializer, m::Int, n::Int, o::Int) where {T} =
- ccall(:jl_alloc_array_3d, Array{T,3}, (Any, Int, Int, Int), Array{T,3}, m, n, o)
- Array{T,N}(::UndefInitializer, d::Vararg{Int,N}) where {T,N} =
- ccall(:jl_new_array, Array{T,N}, (Any, Any), Array{T,N}, d)
- # type and dimensionality specified, accepting dims as tuples of Ints
- Array{T,1}(::UndefInitializer, d::NTuple{1,Int}) where {T} = Array{T,1}(undef, getfield(d,1))
- Array{T,2}(::UndefInitializer, d::NTuple{2,Int}) where {T} = Array{T,2}(undef, getfield(d,1), getfield(d,2))
- Array{T,3}(::UndefInitializer, d::NTuple{3,Int}) where {T} = Array{T,3}(undef, getfield(d,1), getfield(d,2), getfield(d,3))
- Array{T,N}(::UndefInitializer, d::NTuple{N,Int}) where {T,N} = ccall(:jl_new_array, Array{T,N}, (Any, Any), Array{T,N}, d)
- # type but not dimensionality specified
- Array{T}(::UndefInitializer, m::Int) where {T} = Array{T,1}(undef, m)
- Array{T}(::UndefInitializer, m::Int, n::Int) where {T} = Array{T,2}(undef, m, n)

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