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    boot.janet on line 2025, 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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