Auto merge of #28270 - arielb1:raw-fat-ops, r=nrc

r? @nrc 

Fixes #17736
Fixes #18829
Fixes #23888
Fixes #28236

src/test/run-pass/issue-27054-primitive-binary-ops.rs

@@ -0,0 +1,14 @@
+// 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.
+
+fn main() {
+    let x = &mut 1;
+    assert_eq!(*x + { *x=2; 1 }, 2);
+}

src/test/run-pass/raw-fat-ptr.rs

@@ -0,0 +1,127 @@
+// 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 raw fat pointer ops
+
+use std::mem;
+
+fn assert_inorder<T: PartialEq + PartialOrd>(a: &[T]) {
+    for i in 0..a.len() {
+        for j in 0..a.len() {
+            if i < j {
+                assert!(a[i] < a[j]);
+                assert!(a[i] <= a[j]);
+                assert!(!(a[i] == a[j]));
+                assert!(a[i] != a[j]);
+                assert!(!(a[i] >= a[j]));
+                assert!(!(a[i] > a[j]));
+            } else if i == j {
+                assert!(!(a[i] < a[j]));
+                assert!(a[i] <= a[j]);
+                assert!(a[i] == a[j]);
+                assert!(!(a[i] != a[j]));
+                assert!(a[i] >= a[j]);
+                assert!(!(a[i] > a[j]));
+            } else {
+                assert!(!(a[i] < a[j]));
+                assert!(!(a[i] <= a[j]));
+                assert!(!(a[i] == a[j]));
+                assert!(a[i] != a[j]);
+                assert!(a[i] >= a[j]);
+                assert!(a[i] > a[j]);
+            }
+        }
+    }
+}
+
+trait Foo { fn foo(&self) -> usize; }
+impl<T> Foo for T {
+    fn foo(&self) -> usize {
+        mem::size_of::<T>()
+    }
+}
+
+struct S<T:?Sized>(u32, T);
+
+fn main() {
+    let mut array = [0,1,2,3,4];
+    let mut array2 = [5,6,7,8,9];
+
+    // fat ptr comparison: addr then extra
+
+    // check ordering for arrays
+    let mut ptrs: Vec<*const [u8]> = vec![
+        &array[0..0], &array[0..1], &array, &array[1..]
+    ];
+
+    let array_addr = &array as *const [u8] as *const u8 as usize;
+    let array2_addr = &array2 as *const [u8] as *const u8 as usize;
+    if array2_addr < array_addr {
+        ptrs.insert(0, &array2);
+    } else {
+        ptrs.push(&array2);
+    }
+    assert_inorder(&ptrs);
+
+    // check ordering for mut arrays
+    let mut ptrs: Vec<*mut [u8]> = vec![
+        &mut array[0..0], &mut array[0..1], &mut array, &mut array[1..]
+    ];
+
+    let array_addr = &mut array as *mut [u8] as *mut u8 as usize;
+    let array2_addr = &mut array2 as *mut [u8] as *mut u8 as usize;
+    if array2_addr < array_addr {
+        ptrs.insert(0, &mut array2);
+    } else {
+        ptrs.push(&mut array2);
+    }
+    assert_inorder(&ptrs);
+
+    let mut u8_ = (0u8, 1u8);
+    let mut u32_ = (4u32, 5u32);
+
+    // check ordering for ptrs
+    let buf: &mut [*const Foo] = &mut [
+        &u8_, &u8_.0,
+        &u32_, &u32_.0,
+    ];
+    buf.sort_by(|u,v| {
+        let u : [*const (); 2] = unsafe { mem::transmute(*u) };
+        let v : [*const (); 2] = unsafe { mem::transmute(*v) };
+        u.cmp(&v)
+    });
+    assert_inorder(buf);
+
+    // check ordering for mut ptrs
+    let buf: &mut [*mut Foo] = &mut [
+        &mut u8_, &mut u8_.0,
+        &mut u32_, &mut u32_.0,
+    ];
+    buf.sort_by(|u,v| {
+        let u : [*const (); 2] = unsafe { mem::transmute(*u) };
+        let v : [*const (); 2] = unsafe { mem::transmute(*v) };
+        u.cmp(&v)
+    });
+    assert_inorder(buf);
+
+    // check ordering for structs containing arrays
+    let ss: (S<[u8; 2]>,
+             S<[u8; 3]>,
+             S<[u8; 2]>) = (
+        S(7, [8, 9]),
+        S(10, [11, 12, 13]),
+        S(4, [5, 6])
+    );
+    assert_inorder(&[
+        &ss.0 as *const S<[u8]>,
+        &ss.1 as *const S<[u8]>,
+        &ss.2 as *const S<[u8]>
+    ]);
+}