Add test of placement-in syntax, analogous to new-box-syntax.rs

Author: pnkfelix

src/test/run-pass/placement-in-syntax.rs

@@ -0,0 +1,37 @@
+// 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.
+
+#![allow(dead_code, unused_variables)]
+#![feature(box_heap)]
+#![feature(placement_in_syntax)]
+
+// Tests that the new `in` syntax works with unique pointers.
+//
+// Compare with new-box-syntax.rs
+
+use std::boxed::{Box, HEAP};
+
+struct Structure {
+    x: isize,
+    y: isize,
+}
+
+pub fn main() {
+    let x: Box<isize> = in HEAP { 2 };
+    let b: Box<isize> = in HEAP { 1 + 2 };
+    let c = in HEAP { 3 + 4 };
+
+    let s: Box<Structure> = in HEAP {
+        Structure {
+            x: 3,
+            y: 4,
+        }
+    };
+}