auto merge of #16933 : nick29581/rust/dst-rvalue, r=nikomatsakis

Closes #16813 

r? @nikomatsakis I feel like I should be checking more things in check_rvalues, but not sure what - I don't properly understand expr_use_visitor

src/test/compile-fail/dst-bad-assign-2.rs

@@ -43,4 +43,5 @@ pub fn main() {
     let f5: &mut Fat<ToBar> = &mut Fat { f1: 5, f2: "some str", ptr: Bar1 {f :42} };
     let z: Box<ToBar> = box Bar1 {f: 36};
     f5.ptr = *z;  //~ ERROR dynamically sized type on lhs of assignment
+    //~^ ERROR E0161
 }

src/test/compile-fail/dst-bad-deep.rs

@@ -22,4 +22,5 @@ pub fn main() {
     let g: &Fat<[int]> = &f;
     let h: &Fat<Fat<[int]>> = &Fat { ptr: *g };
     //~^ ERROR trying to initialise a dynamically sized struct
+    //~^^ ERROR E0161
 }

src/test/compile-fail/dst-rvalue.rs

@@ -0,0 +1,20 @@
+// Copyright 2014 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 dynamically sized rvalues are forbidden
+
+pub fn main() {
+    let _x: Box<str> = box *"hello world";
+    //~^ ERROR E0161
+
+    let array: &[int] = &[1, 2, 3];
+    let _x: Box<[int]> = box *array;
+    //~^ ERROR E0161
+}

src/test/compile-fail/issue-5883.rs

@@ -17,6 +17,8 @@ struct Struct {
 fn new_struct(r: A+'static) -> Struct {
     //~^ ERROR variable `r` has dynamically sized type
     Struct { r: r } //~ ERROR trying to initialise a dynamically sized struct
+    //~^ ERROR E0161
+    //~^^ ERROR E0161
 }
 
 trait Curve {}

src/test/compile-fail/unsized3.rs

@@ -51,8 +51,10 @@ fn f8<Sized? X>(x1: &S<X>, x2: &S<X>) {
 
 // Test some tuples.
 fn f9<Sized? X>(x1: Box<S<X>>, x2: Box<E<X>>) {
-    f5(&(*x1, 34i)); //~ERROR instantiating a type parameter with an incompatible type `(S<X>,int)`,
-    f5(&(32i, *x2)); //~ERROR instantiating a type parameter with an incompatible type `(int,E<X>)`,
+    f5(&(*x1, 34i)); //~ERROR E0161
+    //~^ ERROR instantiating a type parameter with an incompatible type
+    f5(&(32i, *x2)); //~ERROR E0161
+    //~^ ERROR instantiating a type parameter with an incompatible type
 }
 
 // I would like these to fail eventually.

src/test/compile-fail/unsized6.rs

@@ -30,11 +30,13 @@ fn f3<Sized? X>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
     let y: X = *x1; //~ERROR variable `y` has dynamically sized type `X`
     let y = *x2; //~ERROR variable `y` has dynamically sized type `X`
     let (y, z) = (*x3, 4i); //~ERROR variable `y` has dynamically sized type `X`
+    //~^ ERROR E0161
 }
 fn f4<Sized? X: T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
     let y: X = *x1;         //~ERROR variable `y` has dynamically sized type `X`
     let y = *x2;            //~ERROR variable `y` has dynamically sized type `X`
     let (y, z) = (*x3, 4i); //~ERROR variable `y` has dynamically sized type `X`
+    //~^ ERROR E0161
 }
 
 fn g1<Sized? X>(x: X) {} //~ERROR variable `x` has dynamically sized type `X`