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.
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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