Generic Iterator::collect() method #6980
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bors
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`len_without_is_empty` improvements fixes: rust-lang#6958 fixes: rust-lang#6972 changelog: Check the return type of `len`. Only integral types, or an `Option` or `Result` wrapping one. changelog: Ensure the return type of `is_empty` matches. e.g. `Option<usize>` -> `Option<bool>`
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