error: redundant clone
      --> tests/test_chain.rs:61:30
       |
    61 |     let mut chain = e.chain().clone();
       |                              ^^^^^^^^ help: remove this
       |
    note: this value is dropped without further use
      --> tests/test_chain.rs:61:21
       |
    61 |     let mut chain = e.chain().clone();
       |                     ^^^^^^^^^
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_clone
       = note: `-D clippy::redundant-clone` implied by `-D clippy::all`

    error[E0658]: use of unstable library feature 'int_abs_diff'
       --> github.com-1ecc6299db9ec823/miniz_oxide-0.6.4/src/inflate/core.rs:824:54
        |
    824 |     if out_buf_size_mask == usize::MAX && source_pos.abs_diff(out_pos) == 1 && out_pos > source_pos {
        |                                                      ^^^^^^^^

    error[E0658]: use of unstable library feature 'int_abs_diff'
       --> github.com-1ecc6299db9ec823/miniz_oxide-0.6.4/src/inflate/core.rs:833:61
        |
    833 |     } else if out_buf_size_mask == usize::MAX && source_pos.abs_diff(out_pos) >= 4 && out_pos > source_pos {
        |                                                             ^^^^^^^^

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