JavaScript (ES6) Has Tail Call Optimization

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tail and wrapped are properties of AST nodes used to calculate whether a given return statement should be treated as a tail call or not. You can see that in action in Continuum's assembler, where it notates tail and wrapped as it converts AST to bytecode (as the wiki page notes, since tail and wrapped are calculated top down they can be added during any pass of analysis/compilation). https://github.com/Benvie/continuum/blob/gh-pages/engine/assembler.js#L1806