jshint / jshint / 1596

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Pull #2185

travis-ci

[[FIX]] Simulate class scope for class expr names

As per the ES6 specification draft:

> # 14.5.14 Runtime Semantics: ClassDefinitionEvaluation
>
> With parameter className.
>
> ClassTail : ClassHeritage[opt] { ClassBody[opt] }
>
> 1. Let lex be the LexicalEnvironment of the running execution context.
> 2. Let classScope be NewDeclarativeEnvironment(lex).
> 3. Let classScopeEnvRec be classScope’s environment record.
> 4. If className is not undefined, then
>    a. Perform classScopeEnvRec.CreateImmutableBinding(className,
>       true).

Source:
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-classdefinitionevaluation

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