Add and generalize ToTokens impls #15732
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It will now `flat_map` over the elements of a `Vec<T>` if `T: ToTokens`
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Jul 18, 2014
Here I add a `ToTokens` impl for `Attribute_` and `Option<T>`, as well as generalize the impl for `Vec<T>`
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Here I add a
ToTokensimpl forAttribute_andOption<T>, as well as generalize the impl forVec<T>