Rebase and fix text changed by master

Author: Esteban Küber

src/test/ui/issue-11692-1.stderr

@@ -1,8 +1,12 @@
-error: format argument must be a string literal.
+error: format argument must be a string literal
   --> $DIR/issue-11692-1.rs:12:12
    |
 LL |     print!(test!());
    |            ^^^^^^^
+help: you might be missing a string literal to format with
+   |
+LL |     print!("{}", test!());
+   |            ^^^^^
 
 error: aborting due to previous error