Merge pull request #71 from JuliaDiff/ox/nofieldsiszero

use Zero rather than DoesNotExist for NO_FIELDS
JuliaDiff · Jan 10, 2020 · b9abd85 · b9abd85
2 parents e5e877b + c3a30b9
commit b9abd85
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diff --git a/src/differentials/composite.jl b/src/differentials/composite.jl
@@ -210,4 +210,4 @@ Constant for the reverse-mode derivative with respect to a structure that has no
 The most notable use for this is for the reverse-mode derivative with respect to the
 function itself, when that function is not a closure.
 """
-const NO_FIELDS = DoesNotExist()
+const NO_FIELDS = Zero()
diff --git a/test/differentials/composite.jl b/test/differentials/composite.jl
@@ -161,4 +161,8 @@ end
             @test (@allocated ChainRulesCore.elementwise_add(bk, bk)) <= 48
         end
     end
+
+    @testset "NO_FIELDS" begin
+        @test NO_FIELDS === Zero()
+    end
 end