Test that autoref'ing beyond method receivers does not leak into two-phase borrows.

Author: pnkfelix

src/test/compile-fail/borrowck/two-phase-nonrecv-autoref.rs

@@ -0,0 +1,39 @@
+// 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.
+
+// revisions: lxl nll g2p
+//[lxl]compile-flags: -Z borrowck=mir -Z two-phase-borrows
+//[nll]compile-flags: -Z borrowck=mir -Z two-phase-borrows -Z nll
+//[g2p]compile-flags: -Z borrowck=mir -Z two-phase-borrows -Z nll -Z two-phase-beyond-autoref
+
+#![feature(rustc_attrs)]
+
+// This is a test checking that when we limit two-phase borrows to
+// method receivers, we do not let other kinds of auto-ref to leak
+// through.
+//
+// The g2p revision illustrates the "undesirable" behavior you would
+// otherwise observe without limiting the phasing to autoref on method
+// receivers (namely, that the test would pass).
+
+fn bar(x: &mut u32) {
+    foo(x, *x);
+    //[lxl]~^ ERROR cannot use `*x` because it was mutably borrowed [E0503]
+    //[nll]~^^ ERROR cannot use `*x` because it was mutably borrowed [E0503]
+}
+
+fn foo(x: &mut u32, y: u32) {
+    *x += y;
+}
+
+#[rustc_error]
+fn main() { //[g2p]~ ERROR compilation successful
+    bar(&mut 5);
+}