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    boot.janet on line 1892, column 1

    (macex x &opt on-binding)
    Expand macros completely. on-binding is an optional callback whenever
    a normal symbolic binding is encounter. This allows macros to easily
    see all bindings use by their arguments by calling macex on their
    contents. The binding itself is also replaced by the value returned by
    on-binding within the expand macro.

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