Error formatting macro: pagetree: java.lang.NullPointerException

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  • dynamic binding *scope* holds collection of things needing cleanup
  • with-open binds a new *scope*, cleans up *scope* at end
  • lib APIs can call a new fn (scope thing) to add a resource to the current bound scope
    • throws exception if no scope available
  • REPL cleans up scope before every loop
  • *scope* is an atom, so N "child" threads can add to it
    • binding conveyance makes this work
    • still up to you to make sure "parent" thread outlives children
  • this patch demonstrates the idea

IMO this nails all the use cases and problems above, with a few
caveats that I think can be subsumed into a single example as follows: