Commits on Jun 6, 2017

1. Add workaround for Safari for loop lexical scope bug …

   Safari raises a syntax error for a `let` or `const` declaration in a
   `for` loop initalization that shadows a parent function's parameter:
   
   ```js
   function a(b) {
     for (let b;;);
   }
   ```
   
   This is valid code, but Safari throws a syntax error. The bug has been
   [reported](https://bugs.webkit.org/show_bug.cgi?id=171041) and since
   [fixed](https://trac.webkit.org/changeset/217200/webkit/trunk/Source) in
   WebKit, so future versions of Safari will not have this problem.
   
   This modifies the scope tracker's `canUseInReferencedScopes` method to
   detect cases where a rename would trigger this bug and use a different
   name.
   
   Fixes babel#559

   

   btmills committed Jun 6, 2017
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2. More idiomatic implementation

   

   btmills committed Jun 6, 2017
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   40f0b4c View commit details

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3. More extensive tests

   

   btmills committed Jun 6, 2017
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   75488d9 View commit details

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4. Better use path API

   

   btmills committed Jun 6, 2017
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   4665255 View commit details

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