checker: limit recursion in Checker.ensure_type_exists/2 to 40 levels (it is usually 4 or less) #21734
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… (it is usually 4 or less)
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… (it is usually 4 or less) (vlang#21734)
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Make the recursive method ensure_type_exists/2 a bit more robust, by terminating early, when the recursion depth exceeds a hard limit of 40 levels.
Without it, an unlimited recursion (which may be caused by various factors) will lead to a stack overflow, which can be harder to diagnose, than an explicit checker error message.