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comments and test for MSVC win64 exception handling added

# Every ^nest level runs away in the try body, and the next one starts from its catch code,
# that is inside a handler which has not returned yet. Nesting handlers does not raise the
# recursion depth, but MSVC win64 keeps the unwound frames until the catch block returns, so
# each nested runaway costs one more full stack budget, ~10MB with the default max_recursion(1000).
# Four levels already overflow a 40MB stack there, while linux needs the same 900KB for any depth.
# In summary, win64 EH is awful: it unwinds the C++ stack but not its own state, so the program dies
# escaping a recursion that fit the stack with room to spare, and the crash points to the wrong place.
@main[]
$nested(0)
^try{ ^nest(3) }{ $exception.handled(true) }
nested $nested

@nest[level]
^if($level>0){
	^try{ ^recurse[] }{
		$nested($nested+1)
		^nest($level-1)
	}
}

@recurse[]
^recurse[]