https://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-forin-div-ofheadevaluation-tdznames-expr-iterationkind-labelset <https://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-forin-div-ofheadevaluation-tdznames-expr-iterationkind-labelset>
I don’t understand step 2: the temporary environment TDZ is created for step 3. All bindings of TDZ are mutable (even the `const`-declared ones). It looks like TDZ is thrown away afterwards. Why is this step necessary? Why are all bindings mutable? Thanks! Axel -- Dr. Axel Rauschmayer a...@rauschma.de rauschma.de
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