proper tail calls

Steven Johnson stejohns at
Tue Jan 22 13:35:52 PST 2008

> If there is no guarantee then the implicit proper tail calls feature
> is useless to someone writing code for a variety of implementations
> (eg web browsers.) If there are implicit proper tail calls then I need
> to know when I can count on them and I will only use them in those
> situations listed in the ES4 spec.

My assumption here was that coders relying on PTC would use the specific
syntax, and implicit PTC might be reserved as an implementation optimization
in other cases.

> Required -- or we have nothing.  Virtually nobody will use the annotation.

And this is where my assumption falls down. Agreed, few people will use the

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