For supporting label, yes that is kinda a problem. However, IMO jumping around labels is an anti-pattern in functional programming, I don't think it needs to be supported. Syntax error might be the most reasonable way in this case.
for 'match', while it is just some thought. I wasn't intended to proposal it but just showing potential of extending `= expression`. Personally I do not think label would be a problem for implementing this pattern. here are two possible solutions I can think of: 1. If `[name]:` exist inside the block, just parse it as object and throw error if the structure doesn't match. 2. If `[label]:` does exist inside the block, only allow in scope jump. (label not accessible outside the scope)
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