Commits on Jan 22, 2018

1. Fix spurious warning on empty proc macro crates …

   While attempting to reproduce #47086 I noticed the
   following warning:
   
   ```shell
   > rustc /dev/null --crate-type proc-macro
   warning: unused variable: `registrar`
    --> /dev/null:0:1
   ```
   
   As there are no macros to register the automatically generated registrar
   function for the crate has no body. As a result its `registrar` argument
   is unused triggering the above warning.
   
   The warning is confusing and not easily actionable by the developer. It
   could also be triggered legitimately by e.g. having all of the macros in
   a crate #[cfg]'ed out.
   
   Fix by naming the generated argument `_registrar` inside
   `mk_registrar()`. This suppresses the unused variable warning.

   

   etaoins committed Jan 22, 2018
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