Accept JSDoc for let and const declarations
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=69642994
Transpile let/const declarations captured by loop closures
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=69657023
Class side inheritance by explicitly copying inherited members.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=69661887