Nicholas Nethercote
9d33a8fe51
Currently the second element is a `Vec<(FlatToken, Spacing)>`. But the vector always has zero or one elements, and the `FlatToken` is always `FlatToken::AttrTarget` (which contains an `AttributesData`), and the spacing is always `Alone`. So we can simplify it to `Option<AttributesData>`. An assertion in `to_attr_token_stream` can can also be removed, because `new_tokens.len()` was always 0 or 1, which means than `range.len()` is always greater than or equal to it, because `range.is_empty()` is always false (as per the earlier assertion).
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