Commits on Jul 19, 2018

1. rustc: Fix two custom attributes with custom derive …

   This commit fixes an issue where multiple custom attributes could not be fed
   into a custom derive in some situations with the `use_extern_macros` feature
   enabled. The problem was that the macro expander didn't consider that it was
   making progress when we were deducing that attributes should be lumped in with
   custom derive invocations.
   
   The fix applied here was to track in the expander if our attribute is changing
   (getting stashed away elsewhere and replaced with a new invocation). If it is
   swapped then it's considered progress, otherwise behavior should remain the
   same.
   
   Closes rust-lang#52525

   

   alexcrichton committed Jul 19, 2018
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