bump Rust, fix error messages

rust-version

@@ -1 +1 @@
-6d77e45f01079fe3d40180b3e256e414ab379f63
+5c5c8eb864e56ce905742b8e97df5506bba6aeef

tests/compile-fail/never_say_never.rs

@@ -6,7 +6,7 @@
 fn main() {
     let y = &5;
     let x: ! = unsafe {
-        *(y as *const _ as *const !)  //~ ERROR entered unreachable code
+        *(y as *const _ as *const !)  //~ ERROR entering unreachable code
     };
     f(x)
 }

tests/compile-fail/never_transmute_humans.rs

@@ -5,6 +5,6 @@ struct Human;
 
 fn main() {
     let _x: ! = unsafe {
-        std::mem::transmute::<Human, !>(Human) //~ ERROR entered unreachable code
+        std::mem::transmute::<Human, !>(Human) //~ ERROR entering unreachable code
     };
 }

tests/compile-fail/never_transmute_void.rs

@@ -6,7 +6,7 @@
 enum Void {}
 
 fn f(v: Void) -> ! {
-    match v {} //~ ERROR  entered unreachable code
+    match v {} //~ ERROR  entering unreachable code
 }
 
 fn main() {

tests/compile-fail/out_of_bounds_ptr_2.rs

@@ -1,4 +1,4 @@
-// error-pattern: attempt to add with overflow
+// error-pattern: overflowing in-bounds pointer arithmetic
 fn main() {
     let v = [0i8; 4];
     let x = &v as *const i8;

tests/compile-fail/ptr_offset_overflow.rs

@@ -1,4 +1,4 @@
-//error-pattern: attempt to add with overflow
+//error-pattern: overflowing in-bounds pointer arithmetic
 fn main() {
     let v = [1i8, 2];
     let x = &v[1] as *const i8;