Added tests for unknown_fields_into

test_suite/tests/compile-fail/conflict/collect-into-wrong-type.rs

@@ -0,0 +1,19 @@
+// Copyright 2018 Serde Developers
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[macro_use]
+extern crate serde_derive;
+
+#[derive(Serialize)] //~ ERROR: the trait bound `&std::string::String: std::iter::Iterator` is not satisfied
+#[serde(repr = "map", unknown_fields_into="other")]
+struct X {
+    a: u32,
+    other: String,
+}
+
+fn main() {}

test_suite/tests/compile-fail/conflict/repr-collect-struct.rs

@@ -0,0 +1,20 @@
+// Copyright 2018 Serde Developers
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[macro_use]
+extern crate serde_derive;
+
+#[derive(Serialize)] //~ ERROR: proc-macro derive panicked
+#[serde(repr = "struct", unknown_fields_into="other")]
+//~^^ HELP: #[serde(unknown_fields_into)] requires repr="map"
+struct X {
+    a: u32,
+    other: HashMap<String, String>,
+}
+
+fn main() {}