Updated affected tests after rebase.

Author: davidtwco

src/test/ui/borrowck/issue-45983.nll.stderr

@@ -4,7 +4,7 @@ warning: not reporting region error due to nll
 LL |     give_any(|y| x = Some(y));
    |                           ^
 
-error: assignment requires that data must outlive free region `'_#2r`
+error: free region `` does not outlive free region `'_#2r`
   --> $DIR/issue-45983.rs:17:27
    |
 LL |     give_any(|y| x = Some(y));

src/test/ui/borrowck/regions-escape-bound-fn-2.nll.stderr

@@ -4,7 +4,7 @@ warning: not reporting region error due to nll
 LL |     with_int(|y| x = Some(y));
    |                           ^
 
-error: assignment requires that data must outlive free region `'_#2r`
+error: free region `` does not outlive free region `'_#2r`
   --> $DIR/regions-escape-bound-fn-2.rs:18:27
    |
 LL |     with_int(|y| x = Some(y));

src/test/ui/nll/closure-requirements/propagate-approximated-shorter-to-static-no-bound.stderr

@@ -32,7 +32,7 @@ LL | |
 LL | |         // Only works if 'x: 'y:
 LL | |         demand_y(x, y, x.get()) //~ WARNING not reporting region error due to nll
 LL | |     });
-   | |_____^
+   | |______^
 
 note: No external requirements
   --> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:44:1

src/test/ui/nll/closure-requirements/propagate-approximated-shorter-to-static-wrong-bound.stderr

@@ -32,7 +32,7 @@ LL | |         // Only works if 'x: 'y:
 LL | |         demand_y(x, y, x.get())
 LL | |         //~^ WARNING not reporting region error due to nll
 LL | |     });
-   | |_____^
+   | |______^
 
 note: No external requirements
   --> $DIR/propagate-approximated-shorter-to-static-wrong-bound.rs:47:1

src/test/ui/nll/issue-50716.rs

@@ -22,7 +22,7 @@ where
     for<'b> &'b T: A,
     <&'static T as A>::X: Sized
 {
-    let _x = *s; //~ ERROR free region `'a` does not outlive free region `'static`
+    let _x = *s; //~ ERROR assignment requires that data must outlive free region `'static`
 }
 
 fn main() {}

src/test/ui/nll/issue-50716.stderr

@@ -1,7 +1,7 @@
-error: free region `'a` does not outlive free region `'static`
+error: assignment requires that data must outlive free region `'static`
   --> $DIR/issue-50716.rs:25:14
    |
-LL |     let _x = *s; //~ ERROR free region `'a` does not outlive free region `'static`
+LL |     let _x = *s; //~ ERROR assignment requires that data must outlive free region `'static`
    |              ^^
 
 error: aborting due to previous error