Chris Connelly 1143ac0268 Allow @ values as indices in for expressions ...

This loosens the compilation of `for` expressions to allow the index
variable to be an `@` value, e.g.

    do @visit for @node, @index in nodes

Within `@visit`, the index of the current node (`@node`) would be
available as `@index`.

Fixes #4411.

2016-12-29 19:00:00 +00:00

12 KiB

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