One of the semantics I suggested and then dismissed for single-frame
continuations was based directly on the operators shift and reset from the
PL research literature.[1] To my eye, when we dressed them up to look like a
function call (with -), they suggested that we were calling a function in
Also notice that, unlike JS 1.7 yield, a function that uses shift is not
special in that it doesn't immediately suspend its body when you first call
it. But because it's a syntactic operator, it's more manageable for
implementors of high-performance ES engines, since they can trivially
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