mir-borrowck: Test for check_access_permissions()

Author: zilbuz

src/test/compile-fail/E0596.rs

@@ -8,7 +8,12 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// revisions: ast mir
+//[mir]compile-flags: -Z emit-end-regions -Z borrowck-mir
+
 fn main() {
     let x = 1;
-    let y = &mut x; //~ ERROR E0596
+    let y = &mut x; //[ast]~ ERROR [E0596]
+                    //[mir]~^ ERROR (Ast) [E0596]
+                    //[mir]~| ERROR (Mir) [E0596]
 }

src/test/compile-fail/borrowck/borrowck-access-permissions.rs

@@ -0,0 +1,76 @@
+// Copyright 2016 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: ast mir
+//[mir]compile-flags: -Z emit-end-regions -Z borrowck-mir
+
+static static_x : i32 = 1;
+static mut static_x_mut : i32 = 1;
+
+fn main() {
+    let x = 1;
+    let mut x_mut = 1;
+
+    { // borrow of local
+        let _y1 = &mut x; //[ast]~ ERROR [E0596]
+                          //[mir]~^ ERROR (Ast) [E0596]
+                          //[mir]~| ERROR (Mir) [E0596]
+        let _y2 = &mut x_mut; // No error
+    }
+
+    { // borrow of static
+        let _y1 = &mut static_x; //[ast]~ ERROR [E0596]
+                                 //[mir]~^ ERROR (Ast) [E0596]
+                                 //[mir]~| ERROR (Mir) [E0596]
+        unsafe { let _y2 = &mut static_x_mut; } // No error
+    }
+
+    { // borrow of deref to box
+        let box_x = Box::new(1);
+        let mut box_x_mut = Box::new(1);
+
+        let _y1 = &mut *box_x; //[ast]~ ERROR [E0596]
+                              //[mir]~^ ERROR (Ast) [E0596]
+                              //[mir]~| ERROR (Mir) [E0596]
+        let _y2 = &mut *box_x_mut; // No error
+    }
+
+    { // borrow of deref to reference
+        let ref_x = &x;
+        let ref_x_mut = &mut x_mut;
+
+        let _y1 = &mut *ref_x; //[ast]~ ERROR [E0596]
+                              //[mir]~^ ERROR (Ast) [E0596]
+                              //[mir]~| ERROR (Mir) [E0596]
+        let _y2 = &mut *ref_x_mut; // No error
+    }
+
+    { // borrow of deref to pointer
+        let ptr_x : *const _ = &x;
+        let ptr_mut_x : *mut _ = &mut x_mut;
+
+        unsafe {
+            let _y1 = &mut *ptr_x; //[ast]~ ERROR [E0596]
+                                  //[mir]~^ ERROR (Ast) [E0596]
+                                  //[mir]~| ERROR (Mir) [E0596]
+            let _y2 = &mut *ptr_mut_x; // No error
+        }
+    }
+
+    { // borrowing mutably through an immutable reference
+        struct Foo<'a> { f: &'a mut i32, g: &'a i32 };
+        let mut foo = Foo { f: &mut x_mut, g: &x };
+        let foo_ref = &foo;
+        let _y = &mut *foo_ref.f; //[ast]~ ERROR [E0389]
+                                 //[mir]~^ ERROR (Ast) [E0389]
+                                 //[mir]~| ERROR (Mir) [E0596]
+                                 // FIXME: Wrong error in MIR
+    }
+}