review comments

src/test/compile-fail/placement-expr-unsafe.rs

@@ -0,0 +1,24 @@
+// 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 that placement in respects unsafe code checks.
+
+#![feature(box_heap)]
+#![feature(placement_in_syntax)]
+
+fn main() {
+    use std::boxed::HEAP;
+
+    let p: *const i32 = &42;
+    let _ = in HEAP { *p }; //~ ERROR requires unsafe
+
+    let p: *const _ = &HEAP;
+    let _ = in *p { 42 }; //~ ERROR requires unsafe
+}

src/test/compile-fail/placement-expr-unstable.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.
+
+// Check that placement in respects unstable code checks.
+
+#![feature(placement_in_syntax)]
+#![feature(core)]
+
+extern crate core;
+
+fn main() {
+    use std::boxed::HEAP; //~ ERROR use of unstable library feature
+
+    let _ = in HEAP { //~ ERROR use of unstable library feature
+        ::core::raw::Slice { //~ ERROR use of unstable library feature
+            data: &42, //~ ERROR use of unstable library feature
+            len: 1 //~ ERROR use of unstable library feature
+        }
+    };
+}