Rollup merge of rust-lang#40296 - topecongiro:add-missing-tests, r=alexcrichton

Add tests for issues with the 'E-needtest' label.

This PR adds tests for the following issues:

Author: Ariel Ben-Yehuda

src/test/codegen/issue-15953.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.
+
+// Test that llvm generates `memcpy` for moving a value
+// inside a function and moving an argument.
+
+struct Foo {
+    x: Vec<i32>,
+}
+
+#[inline(never)]
+#[no_mangle]
+// CHECK: memcpy
+fn interior(x: Vec<i32>) -> Vec<i32> {
+    let Foo { x } = Foo { x: x };
+    x
+}
+
+#[inline(never)]
+#[no_mangle]
+// CHECK: memcpy
+fn exterior(x: Vec<i32>) -> Vec<i32> {
+    x
+}
+
+fn main() {
+    let x = interior(Vec::new());
+    println!("{:?}", x);
+
+    let x = exterior(Vec::new());
+    println!("{:?}", x);
+}

src/test/compile-fail/issue-18446.rs

@@ -0,0 +1,29 @@
+// 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.
+
+// Test that name clashes between the method in an impl for the type
+// and the method in the trait when both are in the same scope.
+
+trait T {
+    fn foo(&self);
+}
+
+impl<'a> T + 'a {
+    fn foo(&self) {}
+}
+
+impl T for i32 {
+    fn foo(&self) {}
+}
+
+fn main() {
+    let x: &T = &0i32;
+    x.foo(); //~ ERROR multiple applicable items in scope [E0034]
+}

src/test/compile-fail/issue-22874.rs

@@ -0,0 +1,20 @@
+// 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 Table {
+    rows: [[String]],
+    //~^ ERROR the trait bound `[std::string::String]: std::marker::Sized` is not satisfied [E0277]
+}
+
+fn f(table: &Table) -> &[String] {
+    &table.rows[0]
+}
+
+fn main() {}

src/test/run-pass/issue-18446.rs

@@ -0,0 +1,21 @@
+// 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.
+
+// Test that methods in trait impls should override default methods.
+
+trait T {
+    fn foo(&self) -> i32 { 0 }
+}
+
+impl<'a> T + 'a {
+    fn foo(&self) -> i32 { 1 }
+}
+
+fn main() {}

src/test/run-pass/issue-23311.rs

@@ -0,0 +1,21 @@
+// 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.
+
+// Test that we do not ICE when pattern matching an array against a slice.
+
+#![feature(slice_patterns)]
+
+fn main() {
+    match "foo".as_bytes() {
+        b"food" => (),
+        &[b'f', ..] => (),
+        _ => ()
+    }
+}