From e5c270a115558613ddd58802bca7d480410c1916 Mon Sep 17 00:00:00 2001
From: Pablo Zubieta <pabloferz@yahoo.com.mx>
Date: Sat, 31 Dec 2016 12:51:29 -0600
Subject: [PATCH] Test that broadcast doesn't propagate too much

---
 test/broadcast.jl | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/test/broadcast.jl b/test/broadcast.jl
index 6292a0065e21d..42ca5b935fa93 100644
--- a/test/broadcast.jl
+++ b/test/broadcast.jl
@@ -409,3 +409,12 @@ Base.Broadcast.broadcast_c(f, ::Type{Array19745}, A, Bs...) =
     @test isa(aa .+ 1, Array19745)
     @test isa(aa .* aa', Array19745)
 end
+
+# broadcast should only "peel off" one container layer
+let io = IOBuffer()
+    broadcast(x -> print(io, x), [Nullable(1.0)])
+    @test String(take!(io)) == "Nullable{Float64}(1.0)"
+    v = []
+    broadcast(x -> push!(v, x), [Nullable(1)])
+    @test get.(v) == get.([Nullable(1)])
+end