Support moving values into closures and async blocks (fixes #150) #152
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Also a minor patch to the
Spanned
derive, which calculated the wrong span for fields which have all optional fields except the last one.This adds syntactical moving. So values used in the closure will be "moved" out of the scope. Even if they are copy (because there's no way to tell). This might be disable, because we also have a runtime check for moved values (which are actually moved).