Fail gracefully on higher-order state in AEVM and accept it in FATE

test/aeso_compiler_tests.erl

@@ -601,5 +601,9 @@ failing_code_gen_contracts() ->
             "Invalid oracle type\n"
             "  oracle(string, (int) => int)\n"
             "The response type must not be higher-order (contain function types).")
+    , ?AEVM(higher_order_state, 3, 3,
+            "Invalid state type\n"
+            "  {f : (int) => int}\n"
+            "The state cannot contain functions in the AEVM. Use FATE if you need this.")
     ].
 

test/contracts/code_errors/higher_order_state.aes

@@ -0,0 +1,7 @@
+contract HigherOrderState =
+
+  record state = {f : int => int}
+
+  entrypoint init() = {f = (x) => x}
+  entrypoint apply(n) = state.f(n)
+  stateful entrypoint inc() = put(state{ f = (x) => state.f(x + 1) })