`fail` keyword

[programmerjake]

i'm mostly repeating what i've seen argued before, after much looking I may have found something relevant to bikeshedding what name to use:

@Aloso

throw and raise are associated with exceptions, which Rust doesn't have, so these names are suboptimal. fail has the disadvantage that it implies an error, but the keyword should work for any type that implements Try, so the type that is returning early isn't necessarily an error. I'm not sure what yeet is supposed to mean, I guess it's a made up word.