diff --git a/src/test/auxiliary/issue_20389.rs b/src/test/auxiliary/issue_20389.rs
new file mode 100644
index 0000000000000..60e3cb13e2e46
--- /dev/null
+++ b/src/test/auxiliary/issue_20389.rs
@@ -0,0 +1,15 @@
+// Copyright 2015 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.
+
+#![feature(associated_types)]
+
+pub trait T {
+    type C;
+}
diff --git a/src/test/compile-fail/issue-18819.rs b/src/test/compile-fail/issue-18819.rs
new file mode 100644
index 0000000000000..32a51ee065b17
--- /dev/null
+++ b/src/test/compile-fail/issue-18819.rs
@@ -0,0 +1,29 @@
+// Copyright 2015 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.
+
+#![feature(associated_types)]
+
+trait Foo {
+    type Item;
+}
+
+struct X;
+
+impl Foo for X {
+    type Item = bool;
+}
+
+fn print_x(_: &Foo, extra: &str) {
+    println!("{}", extra);
+}
+
+fn main() {
+    print_x(X);  //~error this function takes 2 parameters but 1 parameter was supplied
+}
diff --git a/src/test/compile-fail/issue-19883.rs b/src/test/compile-fail/issue-19883.rs
new file mode 100644
index 0000000000000..5f1d0f4ab7bcf
--- /dev/null
+++ b/src/test/compile-fail/issue-19883.rs
@@ -0,0 +1,27 @@
+// Copyright 2015 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.
+
+#![feature(associated_types)]
+
+trait From<Src> {
+    type Output;
+
+    fn from(src: Src) -> <Self as From<Src>>::Output;
+}
+
+trait To {
+    // This is a typo, the return type should be `<Dst as From<Self>>::Output`
+    fn to<Dst: From<Self>>(self) -> <Dst as From<Self>>::Dst {
+    //~ error: the trait `core::kinds::Sized` is not implemented
+        From::from(self)
+    }
+}
+
+fn main() {}
diff --git a/src/test/compile-fail/issue-20005.rs b/src/test/compile-fail/issue-20005.rs
new file mode 100644
index 0000000000000..d5b04c1864367
--- /dev/null
+++ b/src/test/compile-fail/issue-20005.rs
@@ -0,0 +1,25 @@
+// Copyright 2015 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.
+
+#![feature(associated_types)]
+
+trait From<Src> {
+    type Result;
+
+    fn from(src: Src) -> Self::Result;
+}
+
+trait To {
+    fn to<Dst>(self) -> <Dst as From<Self>>::Result where Dst: From<Self> {
+        From::from(self)  //~error: type annotations required
+    }
+}
+
+fn main() {}
diff --git a/src/test/run-pass/issue-17732.rs b/src/test/run-pass/issue-17732.rs
new file mode 100644
index 0000000000000..45d3b53132dbf
--- /dev/null
+++ b/src/test/run-pass/issue-17732.rs
@@ -0,0 +1,18 @@
+// Copyright 2015 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.
+
+#![feature(associated_types)]
+trait Person {
+    type string;
+}
+
+struct Someone<P: Person>;
+
+fn main() {}
diff --git a/src/test/run-pass/issue-19479.rs b/src/test/run-pass/issue-19479.rs
new file mode 100644
index 0000000000000..b3354530a0c38
--- /dev/null
+++ b/src/test/run-pass/issue-19479.rs
@@ -0,0 +1,23 @@
+// Copyright 2015 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.
+
+#![feature(associated_types)]
+trait Base {}
+trait AssocA {
+    type X: Base;
+}
+trait AssocB {
+    type Y: Base;
+}
+impl<T: AssocA> AssocB for T {
+    type Y = <T as AssocA>::X;
+}
+
+fn main() {}
diff --git a/src/test/run-pass/issue-19631.rs b/src/test/run-pass/issue-19631.rs
new file mode 100644
index 0000000000000..d036bab99f880
--- /dev/null
+++ b/src/test/run-pass/issue-19631.rs
@@ -0,0 +1,23 @@
+// Copyright 2015 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.
+
+#![feature(associated_types)]
+
+trait PoolManager {
+    type C;
+}
+
+struct InnerPool<M> {
+    manager: M,
+}
+
+impl<M> InnerPool<M> where M: PoolManager {}
+
+fn main() {}
diff --git a/src/test/run-pass/issue-19632.rs b/src/test/run-pass/issue-19632.rs
new file mode 100644
index 0000000000000..9bc74e5017305
--- /dev/null
+++ b/src/test/run-pass/issue-19632.rs
@@ -0,0 +1,21 @@
+// Copyright 2015 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.
+
+#![feature(associated_types)]
+
+trait PoolManager {
+    type C;
+}
+
+struct InnerPool<M: PoolManager> {
+    manager: M,
+}
+
+fn main() {}
diff --git a/src/test/run-pass/issue-19850.rs b/src/test/run-pass/issue-19850.rs
new file mode 100644
index 0000000000000..cd56fe1868924
--- /dev/null
+++ b/src/test/run-pass/issue-19850.rs
@@ -0,0 +1,30 @@
+// Copyright 2015 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.
+
+// Test that `<Type as Trait>::Output` and `Self::Output` are accepted as type annotations in let
+// bindings
+
+#![feature(associated_types)]
+
+trait Int {
+    fn one() -> Self;
+    fn leading_zeros(self) -> uint;
+}
+
+trait Foo {
+    type T : Int;
+
+    fn test(&self) {
+        let r: <Self as Foo>::T = Int::one();
+        let r: Self::T = Int::one();
+    }
+}
+
+fn main() {}
diff --git a/src/test/run-pass/issue-20009.rs b/src/test/run-pass/issue-20009.rs
new file mode 100644
index 0000000000000..535538793d1cf
--- /dev/null
+++ b/src/test/run-pass/issue-20009.rs
@@ -0,0 +1,22 @@
+// Copyright 2015 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.
+
+// Check that associated types are `Sized`
+
+#![feature(associated_types)]
+
+trait Trait {
+    type Output;
+
+    fn is_sized(&self) -> Self::Output;
+    fn wasnt_sized(&self) -> Self::Output { loop {} }
+}
+
+fn main() {}
diff --git a/src/test/run-pass/issue-20389.rs b/src/test/run-pass/issue-20389.rs
new file mode 100644
index 0000000000000..0ef14149c9430
--- /dev/null
+++ b/src/test/run-pass/issue-20389.rs
@@ -0,0 +1,22 @@
+// Copyright 2015 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.
+
+// aux-build:issue_20389.rs
+
+#![feature(associated_types)]
+extern crate issue_20389;
+
+struct Foo;
+
+impl issue_20389::T for Foo {
+    type C = ();
+}
+
+fn main() {}