Auto merge of #53314 - nikomatsakis:nll-invert-liveness, r=pnkfelix

NLL: experiment with inverting liveness

I got inspired to see what would happen here.

Fixes #52460

r? @pnkfelix

src/test/ui/nll/maybe-initialized-drop-implicit-fragment-drop.rs

@@ -8,10 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//compile-flags: -Z emit-end-regions -Zborrowck=mir
-
-
 #![allow(warnings)]
+#![feature(nll)]
 
 struct Wrap<'p> { p: &'p mut i32 }
 

src/test/ui/nll/maybe-initialized-drop-implicit-fragment-drop.stderr

@@ -1,5 +1,5 @@
 error[E0506]: cannot assign to `x` because it is borrowed
-  --> $DIR/maybe-initialized-drop-implicit-fragment-drop.rs:32:5
+  --> $DIR/maybe-initialized-drop-implicit-fragment-drop.rs:30:5
    |
 LL |     let wrap = Wrap { p: &mut x };
    |                          ------ borrow of `x` occurs here