test: Smoke test fmt::Pointer

Author: richo

src/test/run-pass/fmt-pointer-trait.rs

@@ -0,0 +1,18 @@
+#![feature(libc)]
+extern crate libc;
+use std::ptr;
+use std::rc::Rc;
+use std::sync::Arc;
+
+fn main() {
+    let p: *const libc::c_void = ptr::null();
+    let rc = Rc::new(1usize);
+    let arc = Arc::new(1usize);
+    let b = Box::new("hi");
+
+    let _ = format!("{:p}{:p}{:p}",
+                    rc, arc, b);
+
+    assert_eq!(format!("{:p}", p),
+               "0x0");
+}