Commits on May 20, 2017

1. compiler: fix RegexSet bug …

   When compiling a RegexSet, it was possible for the jump locations to
   become incorrect if the last regex in the set had a starting location
   that didn't correspond to the beginning of its program. This can happen
   in simple cases like when your set consists of the regexes `a` and `β`.
   In particular, the program for `β` is:
   
       0: Bytes(\xB2) (goto 2)
       1: Bytes(\xCE) (goto 0)
       2: MATCH
   
   Where the entry point is `1` instead of `0`. To fix this, we compile a
   set of regexes similarly to how we compile `a|β`, where we handle the
   holes produced by sub-expressions correctly.
   
   Fixes #353

   

   BurntSushi committed May 20, 2017
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