Disallow structs in events without ABIEncoderV2

test/libsolidity/SolidityABIJSON.cpp

@@ -1036,6 +1036,7 @@ BOOST_AUTO_TEST_CASE(return_structs_with_contracts)
 BOOST_AUTO_TEST_CASE(event_structs)
 {
 	char const* text = R"(
+		pragma experimental ABIEncoderV2;
 		contract C {
 			struct S { uint a; T[] sub; bytes b; }
 			struct T { uint[2] x; }

test/libsolidity/syntaxTests/emit/emit_empty.sol

@@ -0,0 +1,7 @@
+contract C {
+  function f() public {
+    emit;
+  }
+}
+// ----
+// ParserError: (45-46): Expected event name or path.

test/libsolidity/syntaxTests/events/event_nested_array.sol

@@ -0,0 +1,5 @@
+contract c {
+    event E(uint[][]);
+}
+// ----
+// TypeError: (25-33): This type is only supported in the new experimental ABI encoder. Use "pragma experimental ABIEncoderV2;" to enable the feature.

test/libsolidity/syntaxTests/events/event_nested_array_2.sol

@@ -0,0 +1,4 @@
+contract c {
+    event E(uint[2][]);
+}
+// ----

test/libsolidity/syntaxTests/events/event_nested_array_in_struct.sol

@@ -0,0 +1,6 @@
+contract c {
+	struct S { uint x; uint[][] arr; }
+    event E(S);
+}
+// ----
+// TypeError: (61-62): This type is only supported in the new experimental ABI encoder. Use "pragma experimental ABIEncoderV2;" to enable the feature.

test/libsolidity/syntaxTests/events/event_struct.sol

@@ -0,0 +1,6 @@
+contract c {
+    struct S { uint a ; }
+    event E(S);
+}
+// ----
+// TypeError: (51-52): This type is only supported in the new experimental ABI encoder. Use "pragma experimental ABIEncoderV2;" to enable the feature.

test/libsolidity/syntaxTests/events/event_struct_indexed.sol

@@ -0,0 +1,6 @@
+contract c {
+    struct S { uint a ; }
+    event E(S indexed);
+}
+// ----
+// TypeError: (51-52): This type is only supported in the new experimental ABI encoder. Use "pragma experimental ABIEncoderV2;" to enable the feature.