-d:nimDebug: calls doAssert false instead of quit in compiler code #17739
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refs #17706 (comment)
this allows getting a stacktrace (if nim was built with one, which could be via libbacktrace or --stacktrace) when compiler would've instead quit with
quit
conf.isDefined("nimDebug")
is preferable towhen defined(debug)
as it doesn't involve re-compiling nim (and the cost of the check is insignificant)