Rollup merge of rust-lang#53129 - nikomatsakis:issue-51172-tweak-test…

…, r=pnkfelix

remove `let x = baz` which was obscuring the real error

fixes rust-lang#51172

src/test/ui/lifetime-errors/ex2a-push-one-existing-name-early-bound.nll.stderr

@@ -4,14 +4,15 @@ warning: not reporting region error due to nll
 LL |     x.push(y); //~ ERROR explicit lifetime required
    |            ^
 
-error[E0282]: type annotations needed
-  --> $DIR/ex2a-push-one-existing-name-early-bound.rs:20:9
+error[E0621]: explicit lifetime required in the type of `y`
+  --> $DIR/ex2a-push-one-existing-name-early-bound.rs:17:5
    |
-LL | let x = baz;
-   |     -   ^^^ cannot infer type for `T`
-   |     |
-   |     consider giving `x` a type
+LL | fn baz<'a, 'b, T>(x: &mut Vec<&'a T>, y: &T)
+   |                                       - consider changing the type of `y` to `&'a T`
+...
+LL |     x.push(y); //~ ERROR explicit lifetime required
+   |     ^^^^^^^^^ lifetime `'a` required
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0282`.
+For more information about this error, try `rustc --explain E0621`.

src/test/ui/lifetime-errors/ex2a-push-one-existing-name-early-bound.rs

@@ -17,5 +17,4 @@ fn baz<'a, 'b, T>(x: &mut Vec<&'a T>, y: &T)
     x.push(y); //~ ERROR explicit lifetime required
 }
 fn main() {
-let x = baz;
 }