id have to check the ASI rules, but I expect that would parse as a do-while loop and result in a SyntaxError. Interesting test case, though. should add to v8's test suite.
> On Feb 22, 2016, at 11:47 AM, Bradley Meck <[email protected]> wrote: > > Does that mean the following would parse as a do expression? > > ```javascript > function foo () { > return > do { > 1; > } > while (true); > } > ``` > >> On Mon, Feb 22, 2016 at 10:43 AM, Caitlin Potter <[email protected]> >> wrote: >> current impl in v8 is to only parse do-expressions in expression contexts >> (as a PrimaryExpr, iirc). So it never gets mixed up with do-while loops, >> which is fine (imo). >> >> I recall seeing discussion about this in tc39 notes at some point, afaik the >> conclusion was that do-expressions dont work in Statement contexts, because >> theres no use case >> >> > On Feb 22, 2016, at 11:38 AM, Bradley Meck <[email protected]> wrote: >> > >> > how will people distinguish `do ... while` from `do` expressions? I tried >> > to find the exact grammar but couldn't after a bit of searching. >> > >> > For example in current JS, >> > >> > ``` >> > do { >> > console.log(1); >> > } >> > while (true); >> > ``` >> > >> > would cause infinite number of `console.log`s. But if the `do` is seen as >> > an expression statement it would only log once. >> > >> > Any pointer to where the grammar is discussed would be quite helpful. >> > _______________________________________________ >> > es-discuss mailing list >> > [email protected] >> > https://mail.mozilla.org/listinfo/es-discuss >
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