Enable try/catch test

test/runtests.jl

@@ -375,19 +375,16 @@ end
     @test autodiff(Reverse, f24, Active, Active(2.0))[1][1] == 3
     @test autodiff(Forward, f24, Duplicated(2.0, 1.0))[1]   == 3
 
-    # See #971
-    @static if VERSION ≥ v"1.9-"
-        function f25(x)
-            try
-                sqrt(-1.0)
-                return 3x
-            catch
-                return 2x
-            end
+    function f25(x)
+        try
+            sqrt(-1.0)
+            return 3x
+        catch
+            return 2x
         end
-        @test autodiff(Reverse, f25, Active, Active(2.0))[1][1] == 2
-        @test autodiff(Forward, f25, Duplicated(2.0, 1.0))[1]   == 2
     end
+    @test autodiff(Reverse, f25, Active, Active(2.0))[1][1] == 2
+    @test autodiff(Forward, f25, Duplicated(2.0, 1.0))[1]   == 2
 
     f26(x) = circshift([1.0, 2x, 3.0], 1)[end]
     @test autodiff(Reverse, f26, Active, Active(2.0))[1][1] == 2
@@ -2449,7 +2446,7 @@ end
     @test autodiff(Reverse, f8, Active, Active(1.5))[1][1] == 0
     @test autodiff(Forward, f8, Duplicated(1.5, 1.0))[1]   == 0
 
-    # On Julia 1.6 the gradients are wrong (0.7 not 1.2)
+    # On Julia 1.6 the gradients are wrong (0.7 not 1.2), see #973
     @static if VERSION ≥ v"1.7-"
         f9(x) = sum(quantile([1.0, x], [0.5, 0.7]))
         @test autodiff(Reverse, f9, Active, Active(2.0))[1][1] == 1.2