Commits on Oct 24, 2019

1. Tweak format string error to point at arguments always …

   Add secondary span labels with no text to make it clear when there's a
   mismatch bewteen the positional arguments in a format string and the
   arguments to the macro. This shouldn't affect experienced users, but it
   should make it easier for newcomers to more clearly understand how
   `format!()` and `println!()` are supposed to be used.
   
   ```
   error: 2 positional arguments in format string, but there is 1 argument
    --> file8.rs:2:14
     |
   2 |     format!("{} {}", 1);
     |              ^^ ^^   -
   ```
   
   instead of
   
   ```
   error: 2 positional arguments in format string, but there is 1 argument
    --> file8.rs:2:14
     |
   2 |     format!("{} {}", 1);
     |              ^^ ^^
   ```

   

   estebank committed Oct 24, 2019
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