view of Eye returns a OneElement

Author: dlfivefifty

src/oneelement.jl

@@ -48,4 +48,11 @@ Base.replace_in_print_matrix(o::OneElement{<:Any,2}, k::Integer, j::Integer, s::
 function Base.setindex(A::Zeros{T,N}, v, kj::Vararg{Int,N}) where {T,N}
     @boundscheck checkbounds(A, kj...)
     OneElement(convert(T, v), kj, axes(A))
-end
+end
+
+
+Base.@propagate_inbounds function view(A::RectOrDiagonal{<:Any,<:AbstractFill}, kr::AbstractRange, j::Integer)
+    @boundscheck checkbounds(A, kr, j)
+    k = findfirst(isequal(j), kr)
+    OneElement(getindex_value(A.diag), isnothing(k) ? 0 : something(k), length(kr))
+end