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* Roberto Ierusalimschy:

>> Labels should have non-lexical scope, extending across the whole
>> function, and the same label must not be used twice within the same
>> function.
> Then should you be able to jump into a block?

Sure, if it's feasible to implement.  Jumping into the middle of a for
statement might not be very meaningful, but the effect is still
precisely defined by the source-to-source translation in the reference
manual, so I don't see a direct problem with such cases.