gpedic / ex_q / cc0998d996277e0115068dfbfe9401a30b0bbb94

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Queue blocks are a scope of their own; bind: brings outside values in (#10)

A step in a queue block can no longer use variables from outside the
block: the block's variables get a context of their own, like quote's
hygiene, so a misspelled step reference is a compile error even when a
variable of that name exists. Outside values come in with
queue bind: [order, limit: opts[:limit]] do, as the queue's first
steps, so they're in the state and in error tuples. Nested blocks bind
what they need. Also removes the changelog's Planned section.

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