`-d:npegTrace` code allocates a number of closures equal to the number of states

[Varriount]

When npegTrace is enabled, a closure is allocated for each state generated by NPeg. This is due to the fact that doTrace is defined inside genTraceCode. For large grammars, this can cause programs to suddenly crash, due to the program attempting to allocate stack memory for all the closure pointers.

[zevv]

Yeah sorry for that, the tracing implementation is not really optimized for size or performance, as it is not something one would typically run into. I do prefer keeping it as-is because of the simple implementation.

Closing the ticket now as part of spring cleaning, feel free to reopen if needed!