1 files changed, 33 insertions, 0 deletions
diff --git a/src/test/ui/compile-fail-migration/ptr-coercion.rs b/src/test/ui/compile-fail-migration/ptr-coercion.rs
new file mode 100644
index 00000000000..1390c9507c1
--- /dev/null
+++ b/src/test/ui/compile-fail-migration/ptr-coercion.rs
@@ -0,0 +1,33 @@
+// Copyright 2014 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.
+
+// Test coercions between pointers which don't do anything fancy like unsizing.
+// These are testing that we don't lose mutability when converting to raw pointers.
+
+pub fn main() {
+    // *const -> *mut
+    let x: *const isize = &42;
+    let x: *mut isize = x; //~  ERROR mismatched types
+                           //~| expected type `*mut isize`
+                           //~| found type `*const isize`
+                           //~| types differ in mutability
+
+    // & -> *mut
+    let x: *mut isize = &42; //~  ERROR mismatched types
+                             //~| expected type `*mut isize`
+                             //~| found type `&isize`
+                             //~| types differ in mutability
+
+    let x: *const isize = &42;
+    let x: *mut isize = x; //~  ERROR mismatched types
+                           //~| expected type `*mut isize`
+                           //~| found type `*const isize`
+                           //~| types differ in mutability
+}