try

    macro
    boot.janet on line 249, column 1

    (try body catch)

    Try something and catch errors. `body` is any expression, and 
    `catch` should be a form, the first element of which is a tuple. 
    This tuple should contain a binding for errors and an optional 
    binding for the fiber wrapping the body. Returns the result of 
    `body` if no error, or the result of `catch` if an error.