missing comma

Author: ToucheSir

test/lib/number.jl

@@ -3,7 +3,7 @@
     @test gradient(floor, 1) === (0.0,)
     @test gradient(ceil, 1) === (0.0,)
     @test gradient(round, 1) === (0.0,)
-    @test gradient(hash, 1) === (nothing)
+    @test gradient(hash, 1) === (nothing,)
     @test gradient(div, 1, 2) === (nothing, nothing)
   end