On Thu, Jan 30, 2014 at 12:24 PM, Brendan Eich <[email protected]> wrote:
> Rick Waldron wrote: > >> >> It is -- special forms that have heads can bind in bodies. We see >> this with formal parameters to functions, also with the defunct >> let blocks and let expressions of ES4. ML has similar forms. >> >> We made this block scoping, and how! Turns out Dart did the same. >> Each iteration gets a fresh binding. If there's a closure in the >> first part of the for(;;) head that captures the loop variable, it >> gets a "0th iteration" binding. >> >> >> Also, there was very positive interest in Waldemar's proposed if-scoped >> let, here: https://mail.mozilla.org/pipermail/es-discuss/2013- >> December/035077.html >> > > Nick Krempel proposed that upthread, just for the record. > Yes, my mistake--I had looked in December archives and found what I thought was the OP. This is the correct OP from November: https://mail.mozilla.org/pipermail/es-discuss/2013-November/035060.html Rick > > Yeah, it's good. It comes from C++ but goes back to Algol, IIRC. Another > precedent for block-scoped bindings that are declared in heads. > > /be >
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