move definition outside to appease Julia 1.0

Author: tpapp

test/methods.jl

@@ -163,9 +163,9 @@
         end
     end
 
+    struct NotAFunction end # not <: Function on purpose, cf #224
+    (::NotAFunction)(x) = abs2(x)
     @testset "do not require f::Function" begin
-        struct NotAFunction end # not <: Function on purpose, cf #224
-        (::NotAFunction)(x) = abs2(x)
         x = 0.7
         for f in [forward_fdm, central_fdm, backward_fdm]
             f(5, 1)(NotAFunction(), x) ≈ 2 * x