Name a number or an index with let

let name = value, in a handler, names a number or an index for the rest
of its block; name = value gives it a new value of the same kind; the
walks and folds inside read it. It compiles to Pure's locals (a slot an
event, 0 when it begins, never saved), a slot a let in a handler, so an
order's loop sums into a let and takes stock through an index let without
finding the item again. A let may not be a declared name, another let in
scope or the walked item, and holds no text. Nine diagnostics and an app
of lets are checked.

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