diff --git a/src/test/compile-fail/E0599.rs b/src/test/compile-fail/E0599.rs
new file mode 100644
index 00000000000..30fca2bac03
--- /dev/null
+++ b/src/test/compile-fail/E0599.rs
@@ -0,0 +1,15 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// 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.
+
+struct Foo;
+
+fn main() {
+    || if let Foo::NotEvenReal() = Foo {}; //~ ERROR E0599
+}
diff --git a/src/test/compile-fail/associated-const-in-trait.rs b/src/test/compile-fail/associated-const-in-trait.rs
new file mode 100644
index 00000000000..f837d9ab8e5
--- /dev/null
+++ b/src/test/compile-fail/associated-const-in-trait.rs
@@ -0,0 +1,24 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// 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.
+
+// #29924
+
+#![feature(const_fn, associated_consts)]
+
+trait Trait {
+    const N: usize;
+}
+
+impl Trait {
+    //~^ ERROR the trait `Trait` cannot be made into an object [E0038]
+    const fn n() -> usize { Self::N }
+}
+
+fn main() {}
diff --git a/src/test/compile-fail/conservative_impl_trait.rs b/src/test/compile-fail/conservative_impl_trait.rs
new file mode 100644
index 00000000000..7fb0ec52f29
--- /dev/null
+++ b/src/test/compile-fail/conservative_impl_trait.rs
@@ -0,0 +1,18 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// 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.
+
+// #39872, #39553
+
+#![feature(conservative_impl_trait)]
+fn will_ice(something: &u32) -> impl Iterator<Item = &u32> {
+    //~^ ERROR the trait bound `(): std::iter::Iterator` is not satisfied [E0277]
+}
+
+fn main() {}
diff --git a/src/test/compile-fail/issue-38857.rs b/src/test/compile-fail/issue-38857.rs
new file mode 100644
index 00000000000..b38b1b9fdc6
--- /dev/null
+++ b/src/test/compile-fail/issue-38857.rs
@@ -0,0 +1,15 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// 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.
+
+fn main() {
+    let a = std::sys::imp::process::process_common::StdioPipes { ..panic!() };
+    //~^ ERROR failed to resolve. Could not find `imp` in `sys` [E0433]
+    //~^^ ERROR module `sys` is private [E0603]
+}
diff --git a/src/test/compile-fail/issue-41880.rs b/src/test/compile-fail/issue-41880.rs
new file mode 100644
index 00000000000..23a2b78a769
--- /dev/null
+++ b/src/test/compile-fail/issue-41880.rs
@@ -0,0 +1,39 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// 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.
+
+fn iterate<T, F>(initial: T, f: F) -> Iterate<T, F> {
+    Iterate {
+        state: initial,
+        f: f,
+    }
+}
+
+pub struct Iterate<T, F> {
+    state: T,
+    f: F
+}
+
+impl<T: Clone, F> Iterator for Iterate<T, F> where F: Fn(&T) -> T {
+    type Item = T;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        self.state = (self.f)(&self.state);
+        Some(self.state.clone())
+    }
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) { (std::usize::MAX, None) }
+}
+
+fn main() {
+    let a = iterate(0, |x| x+1);
+    println!("{:?}", a.iter().take(10).collect::<Vec<usize>>());
+    //~^ ERROR no method named `iter` found for type `Iterate<{integer}
+}
diff --git a/src/test/run-pass/conservative_impl_trait.rs b/src/test/run-pass/conservative_impl_trait.rs
new file mode 100644
index 00000000000..30090018e29
--- /dev/null
+++ b/src/test/run-pass/conservative_impl_trait.rs
@@ -0,0 +1,19 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// 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.
+
+// #39665
+
+#![feature(conservative_impl_trait)]
+
+fn batches(n: &u32) -> impl Iterator<Item=&u32> {
+    std::iter::once(n)
+}
+
+fn main() {}
diff --git a/src/test/run-pass/issue-43483.rs b/src/test/run-pass/issue-43483.rs
new file mode 100644
index 00000000000..48482af76db
--- /dev/null
+++ b/src/test/run-pass/issue-43483.rs
@@ -0,0 +1,23 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// 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.
+
+trait VecN {
+    const DIM: usize;
+}
+
+trait Mat {
+    type Row: VecN;
+}
+
+fn m<M: Mat>() {
+    let x = M::Row::DIM;
+}
+
+fn main() {}