apply suggestion from comments and fix a dispatching error

Author: johnnychen94

src/OffsetArrays.jl

@@ -95,12 +95,12 @@ end
 
 for FT in (:OffsetArray, :OffsetVector, :OffsetMatrix)
     # The only route out to inner constructor
-    @eval function $FT(A::AbstractArray{T}, offsets::NTuple{N, Integer}) where {T, N}
+    @eval function $FT(A::AbstractArray{T, N}, offsets::NTuple{N, Integer}) where {T, N}
         ndims(A) == N || throw(DimensionMismatch("The number of offsets $(N) should equal ndims(A) = $(ndims(A))"))
         OffsetArray{T, ndims(A), typeof(A)}(A, offsets)
     end
     # nested OffsetArrays
-    @eval $FT(A::OffsetArray{T}, offsets::NTuple{N, Integer}) where {T,N} = $FT(parent(A), A.offsets .+ offsets)
+    @eval $FT(A::OffsetArray{T, N}, offsets::NTuple{N, Integer}) where {T,N} = $FT(parent(A), A.offsets .+ offsets)
     # convert ranges to offsets
     @eval function $FT(A::AbstractArray{T}, inds::NTuple{N,OffsetAxisKnownLength}) where {T,N}
         axparent = axes(A)

test/runtests.jl

@@ -92,7 +92,7 @@ end
 end
 
 @testset "Constructors" begin
-    @testset "0-dimensional array" begin
+    @testset "Single-entry arrays in dims 0:5" begin
         for n = 0:5
             for z in (OffsetArray(ones(Int,ntuple(d->1,n)), ntuple(x->x-1,n)),
                     fill!(OffsetArray{Float64}(undef, ntuple(x->x:x, n)), 1),
@@ -109,7 +109,9 @@ end
         @test axes(a) == ()
         @test ndims(a) == 0
         @test a[] == 3
-        @test a == OffsetArray(a, ())
+        @test a === OffsetArray(a, ())
+        @test_throws DimensionMismatch OffsetArray(a, 0)
+        @test_throws DimensionMismatch OffsetArray(a0, 0)
     end
 
     @testset "OffsetVector" begin