A generic binding inside a function that a nested function read before
the declaration lowered stores its instance into a TDZ box when the
declaration runs. That value was the instance's closure, which the
backend interns for module functions, so every evaluation of the
declaration stored the same function object. JavaScript makes a new one
each time. The stored value is now a closure over a lifted forwarder that
calls the instance, so each evaluation allocates a new closure; the
forwarder is created once per instance. Async and rest-parameter
bindings read this way report SC1090.
Corpus 7180 checks the identities.
Chris Tate
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