Commits on Nov 30, 2016

1. Make Error a tuple again …

   This is an ergonomic concern. When matching on an error-chain error
   it is more convenient to write
   
   ```
   match download_with_backend(backend, url, callback) {
       Err(Error(ErrorKind::BackendUnavailable(_), _)) => (),
       Err(e) => return Err(e),
       Ok(()) => return Ok(()),
   }
   ```
   
   than
   
   ```
   match download_with_backend(backend, url, callback) {
       Err(Error { kind: ErrorKind::BackendUnavailable(_), .. }) => (),
       Err(e) => return Err(e),
       Ok(()) => return Ok(()),
   }
   ```

   

   brson committed Nov 30, 2016
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2. Reexport ResultExt

   

   brson committed Nov 30, 2016
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3. Move ResultExt back into the macro so that inference works again …

   Fixes #68

   

   brson committed Nov 30, 2016
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4. Add ErrorKind back to the links { } section to fix coherence issues …

   Without this one cannot actually create links across crates.

   

   brson committed Nov 30, 2016
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5. Add test case for tuple error matches

   

   brson committed Nov 30, 2016
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6. Bump version to 0.7.0

   

   brson committed Nov 30, 2016
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7. Add more docs …

   Especially about pattern matching.

   

   brson committed Nov 30, 2016
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8. Polish the quickstart.rs file

   

   brson committed Nov 30, 2016
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