mark as broken the test that fails on 1.0

Author: oxinabox

test/chainrules.jl

@@ -144,10 +144,18 @@ using Zygote, Test, ChainRules
 
         @test (1,) == h(1)
 
-        a3, pb3 = Zygote.pullback(h, 1)
-        @test ((1,),) == pb3(1)
-    end
 
+        if VERSION > v"1"
+            a3, pb3 = Zygote.pullback(h, 1)
+            @test ((1,),) == pb3(1)
+        else
+            # broken on Julia 1.0 because of https://github.com/FluxML/Zygote.jl/issues/638
+            @test_broken begin
+                a3, pb3 = Zygote.pullback(h, 1);  # line that errors
+                ((1,),) == pb3(1)  # line actually being tested
+            end
+        end
+    end
 
     @testset "kwargs" begin
         kwfoo_rrule_hitcount = Ref(0)