Learned about Val form of ntuple()

base/abstractarray.jl

@@ -2186,13 +2186,13 @@ end
 
 _typed_hvncat(T::Type, dim::Int, ::Bool, xs...) = _typed_hvncat(T, Val(dim), xs...) # catches from _hvncat type promoters
 _typed_hvncat(::Type{T}, ::Val) where T = Vector{T}()
-_typed_hvncat(T::Type, ::Val{N}, xs::Number...) where N = _typed_hvncat(T, (ntuple(x -> 1, N - 1)..., length(xs)), false, xs...)
+_typed_hvncat(T::Type, ::Val{N}, xs::Number...) where N = _typed_hvncat(T, (ntuple(x -> 1, Val(N - 1))..., length(xs)), false, xs...)
 function _typed_hvncat(::Type{T}, ::Val{N}, as::AbstractArray...) where {T, N}
     # optimization for arrays that can be concatenated by copying them linearly into the destination
     # conditions: the elements must all have 1- or 0-length dimensions above N
     for a ∈ as
         ndims(a) <= N || all(x -> size(a, x) == 1, (N + 1):ndims(a)) ||
-            return _typed_hvncat(T, (ntuple(x -> 1, N - 1)..., length(as)), false, as...)
+            return _typed_hvncat(T, (ntuple(x -> 1, Val(N - 1))..., length(as)), false, as...)
     end
 
     nd = N
@@ -2227,7 +2227,7 @@ function _typed_hvncat(::Type{T}, ::Val{N}, as...) where {T, N}
         nd = max(nd, cat_ndims(as[i]))
     end
 
-    A = Array{T, nd}(undef, ntuple(x -> 1, N - 1)..., Ndim, ntuple(x -> 1, nd - N)...)
+    A = Array{T, nd}(undef, ntuple(x -> 1, Val(N - 1))..., Ndim, ntuple(x -> 1, nd - N)...)
 
     k = 1
     for a ∈ as