Brendan Eich wrote:
But to recap the TC39 meeting discussion, we do not believe we can add =>* or =>! -- the latter is arrow with a unary logical negation expression as the body. Other places to put the * and ! are problematic due to ASI. So what exactly are we gonna do for async arrows, if anything? We said no/defer to generator arrows.
To say a bit more, if we don't want 'yield' in the body of an arrow to imply that that arrow function is a generator function, then the same argument seems to apply to 'await'. So we need a sigil or equivalent. But =>! is at least as infeasible as =>*. So perhaps we cannot reserve 'await' in ES6 arrows.
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