Merge remote-tracking branch 'ralf/rustup-validity'

Author: RalfJung

tests/compile-fail/slice-too-big.rs

@@ -2,5 +2,5 @@ use std::mem;
 
 fn main() { unsafe {
     let ptr = Box::into_raw(Box::new(0u8));
-    let _x: &[u8] = mem::transmute((ptr, usize::MAX)); //~ ERROR: invalid slice: total size is bigger than largest supported object
+    let _x: &[u8] = mem::transmute((ptr, usize::MAX)); //~ ERROR: invalid reference metadata: slice is bigger than largest supported object
 } }