Test nested broadcast

Author: jishnub

test/structuredbroadcast.jl

@@ -388,4 +388,10 @@ end
     @test ind == CartesianIndex(1,1)
 end
 
+@testset "nested triangular broadcast" begin
+    L = LowerTriangular(rand(Int,4,4))
+    M = Matrix(L)
+    @test L .+ L .+ 0 .+ L .+ 0 .- L == 2M
+end
+
 end