Fix missing symbol in _sub_axes

Author: Tokazama

src/axes.jl

@@ -119,6 +119,7 @@ axes(A::SubArray) = _sub_axes(parent(A), A.indices)
             for j in 1:ndims(I_i)
                 push!(t.args, :(getfield($(axsi), $j)))
             end
+            push!(out.args, Expr(:(=), axsi, :(getfield(axes(getfield(inds, $i))))))
         end
     end
     push!(out.args, t)