Commits on Jun 4, 2021

1. rustdoc: Print a warning if the diff when comparing to old nightlies … …

   …is empty
   
   This avoids confusing situations where it's unclear whether there's a
   bug in the diff tool or not:
   
   ```
   26: @Has check failed
           `XPATH PATTERN` did not match
           // @Has - '//code/a[@href="{{channel}}/std/primitive.i32.html"]' 'i32'
   
   Encountered 6 errors
   
   ------------------------------------------
   
   info: generating a diff against nightly rustdoc
   
   failures:
       [rustdoc] rustdoc/primitive-reexport.rs
   ```

   

   jyn514 committed Jun 4, 2021
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