syntax: correct the Rand::rand call to select enum variants in #[deriving(Rand)]. #7121
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…ving(Rand)]. Previously, this was not a global call, and so when `#[deriving(Rand)]` was in any module other than the top-level one, it failed (unless there was a `use std;` in scope). Also, fix a minor inconsistency between uints and u32s for this piece of code.
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[missing_const_for_fn] fix rust-lang#7121 *Please write a short comment explaining your change (or "none" for internal only changes)* changelog: [`missing_const_for_fn`] note about removing const may break compatibility fix rust-lang#7121
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r? @pnkfelix