Use box syntax in vec! macro

Closes #28950.

Author: apasel422

src/libcollections/lib.rs

@@ -30,6 +30,7 @@
 #![cfg_attr(not(stage0), deny(warnings))]
 
 #![feature(alloc)]
+#![feature(allow_internal_unstable)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(core_intrinsics)]

src/libcollections/macros.rs

@@ -41,12 +41,13 @@
 #[cfg(not(test))]
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[allow_internal_unstable]
 macro_rules! vec {
     ($elem:expr; $n:expr) => (
         $crate::vec::from_elem($elem, $n)
     );
     ($($x:expr),*) => (
-        <[_]>::into_vec($crate::boxed::Box::new([$($x),*]))
+        <[_]>::into_vec(box [$($x),*])
     );
     ($($x:expr,)*) => (vec![$($x),*])
 }
@@ -61,7 +62,7 @@ macro_rules! vec {
         $crate::vec::from_elem($elem, $n)
     );
     ($($x:expr),*) => (
-        $crate::slice::into_vec($crate::boxed::Box::new([$($x),*]))
+        $crate::slice::into_vec(box [$($x),*])
     );
     ($($x:expr,)*) => (vec![$($x),*])
 }

src/test/run-pass/borrow-by-val-method-receiver.rs

@@ -8,9 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-
-// pretty-expanded FIXME #23616
-
 trait Foo {
     fn foo(self);
 }

src/test/run-pass/borrowck/borrowck-binding-mutbl.rs

@@ -8,9 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-
-// pretty-expanded FIXME #23616
-
 struct F { f: Vec<isize> }
 
 fn impure(_v: &[isize]) {

src/test/run-pass/generic-ivec-leak.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// pretty-expanded FIXME #23616
-
 enum wrapper<T> { wrapped(T), }
 
 pub fn main() { let _w = wrapper::wrapped(vec!(1, 2, 3, 4, 5)); }

src/test/run-pass/issue-17816.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// pretty-expanded FIXME #23616
-
 #![feature(unboxed_closures)]
 
 use std::marker::PhantomData;

src/test/run-pass/issue-18514.rs

@@ -15,7 +15,6 @@
 // impl.
 
 // aux-build:issue-18514.rs
-// pretty-expanded FIXME #23616
 
 extern crate issue_18514 as ice;
 use ice::{Tr, St};

src/test/run-pass/issue-2631-b.rs

@@ -11,8 +11,6 @@
 
 // aux-build:issue-2631-a.rs
 
-// pretty-expanded FIXME #23616
-
 extern crate req;
 
 use req::request;

src/test/run-pass/issue-2723-b.rs

@@ -10,8 +10,6 @@
 
 // aux-build:issue_2723_a.rs
 
-// pretty-expanded FIXME #23616
-
 extern crate issue_2723_a;
 use issue_2723_a::f;
 

src/test/run-pass/issue-28950.rs

@@ -0,0 +1,23 @@
+// Copyright 2012-2016 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.
+
+// Tests that the `vec!` macro does not overflow the stack when it is
+// given data larger than the stack.
+
+const LEN: usize = 1 << 15;
+
+use std::thread::Builder;
+
+fn main() {
+    assert!(Builder::new().stack_size(LEN / 2).spawn(|| {
+        let vec = vec![[0; LEN]];
+        assert_eq!(vec.len(), 1);
+    }).unwrap().join().is_ok());
+}