Add tests for #17001, #21449, #22992, #23208, #23442

Closes #17001
Closes #21449
Closes #22992
Closes #23208
Closes #23442

src/test/compile-fail/issue-17001.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.
+
+mod foo {}
+
+fn main() {
+    let p = foo { x: () }; //~ ERROR `foo` does not name a structure
+}

src/test/compile-fail/issue-21449.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.
+
+mod MyMod {}
+
+fn main() {
+    let myVar = MyMod { T: 0 }; //~ ERROR `MyMod` does not name a structure
+}

src/test/run-pass/issue-22992-2.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.
+
+struct A(B);
+struct B;
+
+use std::ops::Deref;
+
+impl Deref for A {
+    type Target = B;
+    fn deref(&self) -> &B { &self.0 }
+}
+
+impl B {
+    fn foo(&self) {}
+}
+
+fn main() {
+    A(B).foo();
+}

src/test/run-pass/issue-22992.rs

@@ -0,0 +1,85 @@
+// 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.
+
+// ignore-pretty
+
+struct X { val: i32 }
+impl std::ops::Deref for X {
+    type Target = i32;
+    fn deref(&self) -> &i32 { &self.val }
+}
+
+
+trait            M                   { fn m(self); }
+impl             M for i32           { fn m(self) { println!("i32::m()"); } }
+impl             M for X             { fn m(self) { println!("X::m()"); } }
+impl<'a>         M for &'a X         { fn m(self) { println!("&X::m()"); } }
+impl<'a, 'b>     M for &'a &'b X     { fn m(self) { println!("&&X::m()"); } }
+impl<'a, 'b, 'c> M for &'a &'b &'c X { fn m(self) { println!("&&&X::m()"); } }
+
+trait            RefM                   { fn refm(&self); }
+impl             RefM for i32           { fn refm(&self) { println!("i32::refm()"); } }
+impl             RefM for X             { fn refm(&self) { println!("X::refm()"); } }
+impl<'a>         RefM for &'a X         { fn refm(&self) { println!("&X::refm()"); } }
+impl<'a, 'b>     RefM for &'a &'b X     { fn refm(&self) { println!("&&X::refm()"); } }
+impl<'a, 'b, 'c> RefM for &'a &'b &'c X { fn refm(&self) { println!("&&&X::refm()"); } }
+
+struct Y { val: i32 }
+impl std::ops::Deref for Y {
+    type Target = i32;
+    fn deref(&self) -> &i32 { &self.val }
+}
+
+struct Z { val: Y }
+impl std::ops::Deref for Z {
+    type Target = Y;
+    fn deref(&self) -> &Y { &self.val }
+}
+
+struct A;
+impl std::marker::Copy for A {}
+impl Clone for A { fn clone(&self) -> Self { *self } }
+impl             M for             A { fn m(self) { println!("A::m()"); } }
+impl<'a, 'b, 'c> M for &'a &'b &'c A { fn m(self) { println!("&&&A::m()"); } }
+impl             RefM for             A { fn refm(&self) { println!("A::refm()"); } }
+impl<'a, 'b, 'c> RefM for &'a &'b &'c A { fn refm(&self) { println!("&&&A::refm()"); } }
+
+fn main() {
+    // I'll use @ to denote left side of the dot operator
+    (*X{val:42}).m();        // i32::refm() , self == @
+    X{val:42}.m();           // X::m()      , self == @
+    (&X{val:42}).m();        // &X::m()     , self == @
+    (&&X{val:42}).m();       // &&X::m()    , self == @
+    (&&&X{val:42}).m();      // &&&X:m()    , self == @
+    (&&&&X{val:42}).m();     // &&&X::m()   , self == *@
+    (&&&&&X{val:42}).m();    // &&&X::m()   , self == **@
+
+    (*X{val:42}).refm();     // i32::refm() , self == @
+    X{val:42}.refm();        // X::refm()   , self == @
+    (&X{val:42}).refm();     // X::refm()   , self == *@
+    (&&X{val:42}).refm();    // &X::refm()  , self == *@
+    (&&&X{val:42}).refm();   // &&X::refm() , self == *@
+    (&&&&X{val:42}).refm();  // &&&X::refm(), self == *@
+    (&&&&&X{val:42}).refm(); // &&&X::refm(), self == **@
+
+    Y{val:42}.refm();        // i32::refm() , self == *@
+    Z{val:Y{val:42}}.refm(); // i32::refm() , self == **@
+
+    A.m();                   // A::m()      , self == @
+    // without the Copy trait, (&A).m() would be a compilation error:
+    // cannot move out of borrowed content
+    (&A).m();                // A::m()      , self == *@
+    (&&A).m();               // &&&A::m()   , self == &@
+    (&&&A).m();              // &&&A::m()   , self == @
+    A.refm();                // A::refm()   , self == @
+    (&A).refm();             // A::refm()   , self == *@
+    (&&A).refm();            // A::refm()   , self == **@
+    (&&&A).refm();           // &&&A::refm(), self == @
+}

src/test/run-pass/issue-23208.rs

@@ -0,0 +1,35 @@
+// 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.
+
+trait TheTrait : TheSuperTrait<<Self as TheTrait>::Item> {
+    type Item;
+}
+
+trait TheSuperTrait<T> {
+    fn get(&self) -> T;
+}
+
+impl TheTrait for i32 {
+    type Item = u32;
+}
+
+impl TheSuperTrait<u32> for i32 {
+    fn get(&self) -> u32 {
+        *self as u32
+    }
+}
+
+fn foo<T:TheTrait<Item=u32>>(t: &T) -> u32 {
+    t.get()
+}
+
+fn main() {
+    foo::<i32>(&22);
+}

src/test/run-pass/issue-23442.rs

@@ -0,0 +1,31 @@
+// 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.
+
+use std::marker::PhantomData;
+
+pub struct UnionedKeys<'a,K>
+    where K: UnifyKey + 'a
+{
+    table: &'a mut UnificationTable<K>,
+    root_key: K,
+    stack: Vec<K>,
+}
+
+pub trait UnifyKey {
+    type Value;
+}
+
+pub struct UnificationTable<K:UnifyKey> {
+    values: Delegate<K>,
+}
+
+pub struct Delegate<K>(PhantomData<K>);
+
+fn main() {}