Couldn't directly use cat_similar (for now)

Author: BioTurboNick

base/abstractarray.jl

@@ -1943,6 +1943,9 @@ end
 _ndims(a::AbstractArray) = ndims(a)
 _ndims(::Any) = 0
 
+_similar(a::AbstractArray, ::Type{T}, nr, nc) where T = similar(a, T, nr, nc)
+_similar(::Any, ::Type{T}, nr, nc) where T = Array{T, 2}(undef, nr, nc)
+
 function _typed_hvcat(::Type{T}, rows::Tuple{Vararg{Int}}, as...) where T
     # handles scalar, vector, and matrix inputs
     nbr = length(rows)  # number of block rows
@@ -1959,7 +1962,7 @@ function _typed_hvcat(::Type{T}, rows::Tuple{Vararg{Int}}, as...) where T
         a += rows[i]
     end
 
-    out = cat_similar(as[1], T, nr, nc)
+    out = _similar(as[1], T, nr, nc)
     a = 1
     r = 1
     for i = 1:nbr