title: Syntax error near "=>" when running pg_upgrade 9.4 to 9.5
body: <p>I am unable to upgrade my postgresql server from 9.4 to 9.5 due to the following error message:</p>
  
  <pre><code>pg_restore: creating OPERATOR "public.-&gt;"
  pg_restore: creating OPERATOR "public.&lt;@"
  pg_restore: creating OPERATOR "public.=&gt;"
  pg_restore: [archiver (db)] Error while PROCESSING TOC:
  pg_restore: [archiver (db)] Error from TOC entry 1617; 2617 17937 OPERATOR =&gt; william
  pg_restore: [archiver (db)] could not execute query: ERROR:  syntax error at or near "=&gt;"
  LINE 1: CREATE OPERATOR =&gt; (
                          ^
      Command was: CREATE OPERATOR =&gt; (
      PROCEDURE = "tconvert",
      LEFTARG = "text",
      RIGHTARG = "text"
  );
  </code></pre>
  
  <p>I have not been able to find anything relevant by googling. The most relevant thing I can find is someone who encountered this issue with a much older version of hstore, and the fix is not clear.</p>
  
  <p>I am using homebrew on a Mac. I would work around the issue with pg_dumpall, but I can no longer run that because the 9.4 binaries are loading the libs for 9.5 following the upgrade. Is there a way around this?</p>