--- /dev/null
+// Copyright 2017 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.
+
+fn main() {
+ let data = std::ptr::null();
+ let _ = &data as *const *const ();
+ if data.is_null() {}
+}
--- /dev/null
+warning[E0619]: the type of this value must be known in this context
+ --> $DIR/inference-variable-behind-raw-pointer.rs:14:13
+ |
+14 | if data.is_null() {}
+ | ^^^^^^^
+ |
+ = note: this will be made into a hard error in a future version of the compiler
+