Fixed views of zero-dimensional arrays

Author: mateuszbaran

src/indexing.jl

@@ -379,3 +379,8 @@ Base.unsafe_view(A::AbstractArray, i1::StaticIndexing, indices::StaticIndexing..
 # instead of unsafe_view so we need this method too (Base._maybe_reindex
 # is a good example)
 Base.SubArray(A::AbstractArray, indices::NTuple{<:Any,StaticIndexing}) = Base.SubArray(A, map(unwrap, indices))
+# this method is defined to prevent infinite recursion when viewing a
+# zero-dimensional array (see issue #705)
+function Base.SubArray(A::AbstractArray, indices::Tuple{})
+    return invoke(Base.SubArray, Tuple{AbstractArray, Tuple}, A, indices)
+end

test/indexing.jl

@@ -205,6 +205,14 @@ using StaticArrays, Test
         @test (zeros(2,0)[SVector(1),SVector{0,Int}()] = 0) == 0
     end
 
+    @testset "Viewing zero-dimensional arrays" begin
+        # issue #705
+        A = zeros()
+        B = MArray{Tuple{},Float64,0,1}(0.0)
+        @test @inferred(view(A))[] == 0.0
+        @test @inferred(view(B))[] == 0.0
+    end
+
     @testset "Using SArray as index for view" begin
         a = collect(11:20)
         @test view(a, SVector(1,2,3)) == [11,12,13]