[INFO] fetching crate letter-sequence 2.1.0...
[INFO] testing letter-sequence-2.1.0 against 1.99.0-beta.8+cargoflags=--release for beta-release-1.100-2
[INFO] extracting crate letter-sequence 2.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate letter-sequence 2.1.0
[INFO] finished tweaking crates.io crate letter-sequence 2.1.0
[INFO] tweaked toml for crates.io crate letter-sequence 2.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate letter-sequence 2.1.0 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate letter-sequence 2.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded derive_builder_macro v0.11.2
[INFO] [stderr]   Downloaded derive_builder v0.11.2
[INFO] [stderr]   Downloaded derive_builder_core v0.11.2
[INFO] [stderr]   Downloaded darling v0.14.1
[INFO] [stderr]   Downloaded darling_macro v0.14.1
[INFO] [stderr]   Downloaded os_str_bytes v6.1.0
[INFO] [stderr]   Downloaded clap_lex v0.2.2
[INFO] [stderr]   Downloaded indexmap v1.9.0
[INFO] [stderr]   Downloaded darling_core v0.14.1
[INFO] [stderr]   Downloaded hashbrown v0.12.1
[INFO] [stderr]   Downloaded clap v3.2.7
[INFO] [stderr]   Downloaded libc v0.2.103
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53
[INFO] running `Command { std: "docker" "start" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.96
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling darling_core v0.14.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.31
[INFO] [stderr]    Compiling thiserror v1.0.31
[INFO] [stderr]    Compiling darling_macro v0.14.1
[INFO] [stderr]    Compiling darling v0.14.1
[INFO] [stderr]    Compiling derive_builder_core v0.11.2
[INFO] [stderr]    Compiling derive_builder_macro v0.11.2
[INFO] [stderr]    Compiling derive_builder v0.11.2
[INFO] [stderr]    Compiling letter-sequence v2.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `new_unchecked` is never used
[INFO] [stdout]   --> src/sequence.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 80 | impl Sequence {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 83 |     fn new_unchecked(inner: u64) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/sequence/combined.rs:55:19
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn sequences(&self) -> std::slice::Iter<Sequence> {
[INFO] [stdout]    |                      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn sequences(&self) -> std::slice::Iter<'_, Sequence> {
[INFO] [stdout]    |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/sequence/combined.rs:59:23
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn sequences_mut(&mut self) -> std::slice::IterMut<Sequence> {
[INFO] [stdout]    |                          ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                          |
[INFO] [stdout]    |                          the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn sequences_mut(&mut self) -> std::slice::IterMut<'_, Sequence> {
[INFO] [stdout]    |                                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/sequence/combined.rs:201:18
[INFO] [stdout]     |
[INFO] [stdout] 201 |     pub fn elements(&self) -> std::slice::Iter<Element> {
[INFO] [stdout]     |                     ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 201 |     pub fn elements(&self) -> std::slice::Iter<'_, Element> {
[INFO] [stdout]     |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/main.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 |     use std::ops::Add;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 13.15s
[INFO] running `Command { std: "docker" "inspect" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "test" "--frozen" "--no-run" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling thiserror v1.0.31
[INFO] [stderr]    Compiling derive_builder v0.11.2
[INFO] [stderr]    Compiling letter-sequence v2.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `new_unchecked` is never used
[INFO] [stdout]   --> src/sequence.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 80 | impl Sequence {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 83 |     fn new_unchecked(inner: u64) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/sequence/combined.rs:55:19
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn sequences(&self) -> std::slice::Iter<Sequence> {
[INFO] [stdout]    |                      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn sequences(&self) -> std::slice::Iter<'_, Sequence> {
[INFO] [stdout]    |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/sequence/combined.rs:59:23
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn sequences_mut(&mut self) -> std::slice::IterMut<Sequence> {
[INFO] [stdout]    |                          ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                          |
[INFO] [stdout]    |                          the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn sequences_mut(&mut self) -> std::slice::IterMut<'_, Sequence> {
[INFO] [stdout]    |                                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/sequence/combined.rs:201:18
[INFO] [stdout]     |
[INFO] [stdout] 201 |     pub fn elements(&self) -> std::slice::Iter<Element> {
[INFO] [stdout]     |                     ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 201 |     pub fn elements(&self) -> std::slice::Iter<'_, Element> {
[INFO] [stdout]     |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/main.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 |     use std::ops::Add;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `max_render_capacity` is never used
[INFO] [stdout]    --> src/sequence/builder.rs:313:5
[INFO] [stdout]     |
[INFO] [stdout] 313 |     fn max_render_capacity() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rollover` is never used
[INFO] [stdout]    --> src/sequence/builder.rs:379:5
[INFO] [stdout]     |
[INFO] [stdout] 379 |     fn rollover() {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/sequence/combined.rs:55:19
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn sequences(&self) -> std::slice::Iter<Sequence> {
[INFO] [stdout]    |                      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn sequences(&self) -> std::slice::Iter<'_, Sequence> {
[INFO] [stdout]    |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/sequence/combined.rs:59:23
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn sequences_mut(&mut self) -> std::slice::IterMut<Sequence> {
[INFO] [stdout]    |                          ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                          |
[INFO] [stdout]    |                          the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn sequences_mut(&mut self) -> std::slice::IterMut<'_, Sequence> {
[INFO] [stdout]    |                                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/sequence/combined.rs:201:18
[INFO] [stdout]     |
[INFO] [stdout] 201 |     pub fn elements(&self) -> std::slice::Iter<Element> {
[INFO] [stdout]     |                     ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 201 |     pub fn elements(&self) -> std::slice::Iter<'_, Element> {
[INFO] [stdout]     |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 11.35s
[INFO] running `Command { std: "docker" "inspect" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "test" "--frozen" "--release", kill_on_drop: false }`
[INFO] [stderr] warning: associated function `new_unchecked` is never used
[INFO] [stderr]   --> src/sequence.rs:83:5
[INFO] [stderr]    |
[INFO] [stderr] 80 | impl Sequence {
[INFO] [stderr]    | ------------- associated function in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 83 |     fn new_unchecked(inner: u64) -> Self {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/sequence/combined.rs:55:19
[INFO] [stderr]    |
[INFO] [stderr] 55 |     pub fn sequences(&self) -> std::slice::Iter<Sequence> {
[INFO] [stderr]    |                      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]    |                      |
[INFO] [stderr]    |                      the lifetime is elided here
[INFO] [stderr]    |
[INFO] [stderr]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]    |
[INFO] [stderr] 55 |     pub fn sequences(&self) -> std::slice::Iter<'_, Sequence> {
[INFO] [stderr]    |                                                 +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/sequence/combined.rs:59:23
[INFO] [stderr]    |
[INFO] [stderr] 59 |     pub fn sequences_mut(&mut self) -> std::slice::IterMut<Sequence> {
[INFO] [stderr]    |                          ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          the lifetime is elided here
[INFO] [stderr]    |
[INFO] [stderr]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]    |
[INFO] [stderr] 59 |     pub fn sequences_mut(&mut self) -> std::slice::IterMut<'_, Sequence> {
[INFO] [stderr]    |                                                            +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/sequence/combined.rs:201:18
[INFO] [stderr]     |
[INFO] [stderr] 201 |     pub fn elements(&self) -> std::slice::Iter<Element> {
[INFO] [stderr]     |                     ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 201 |     pub fn elements(&self) -> std::slice::Iter<'_, Element> {
[INFO] [stderr]     |                                                +++
[INFO] [stderr] 
[INFO] [stderr] warning: `letter-sequence` (lib) generated 4 warnings (run `cargo fix --lib -p letter-sequence` to apply 3 suggestions)
[INFO] [stderr] warning: unused import: `std::ops::Add`
[INFO] [stderr]  --> src/main.rs:8:6
[INFO] [stderr]   |
[INFO] [stderr] 8 |     use std::ops::Add;
[INFO] [stderr]   |         ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `letter-sequence` (bin "letter-sequence" test) generated 1 warning (run `cargo fix --bin "letter-sequence" -p letter-sequence --tests` to apply 1 suggestion)
[INFO] [stderr] warning: function `max_render_capacity` is never used
[INFO] [stderr]    --> src/sequence/builder.rs:313:5
[INFO] [stderr]     |
[INFO] [stderr] 313 |     fn max_render_capacity() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `rollover` is never used
[INFO] [stderr]    --> src/sequence/builder.rs:379:5
[INFO] [stderr]     |
[INFO] [stderr] 379 |     fn rollover() {
[INFO] [stderr]     |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `letter-sequence` (lib test) generated 5 warnings (3 duplicates)
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 0.03s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/release/deps/letter_sequence-b84d4884abce931d)
[INFO] [stdout] running 16 tests
[INFO] [stdout] test sequence::combined::test::one_char ... ok
[INFO] [stdout] test sequence::combined::test::segment_access ... ok
[INFO] [stdout] test sequence::combined::test::one_char_with_rollover ... ok
[INFO] [stdout] test sequence::combined::test::two_char ... ok
[INFO] [stdout] test element::test::display ... ok
[INFO] [stdout] test sequence::test::lower ... ok
[INFO] [stdout] test sequence::test::zero ... ok
[INFO] [stdout] test sequence::test::rollover ... ok
[INFO] [stdout] test sequence::test::upper ... ok
[INFO] [stdout] test sequence::helper::test::char::simple ... ok
[INFO] [stdout] test sequence::test::assignmod ... ok
[INFO] [stdout] test sequence::test::default ... ok
[INFO] [stdout] test sequence::test::new_unchecked ... ok
[INFO] [stdout] test sequence::combined::test::two_char_with_rollover1 ... ok
[INFO] [stdout] test sequence::test::num ... ok
[INFO] [stdout] test sequence::builder::test::simple ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/letter_sequence-923f91caffee9899)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests letter_sequence
[INFO] [stdout] 
[INFO] [stdout] running 22 tests
[INFO] [stdout] test src/lib.rs - derive_builder (line 36) ... FAILED
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::int_to_char (line 36) ... FAILED
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder::max_render_capacity (line 141) ... FAILED
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 61) ... FAILED
[INFO] [stdout] test src/sequence.rs - sequence::Sequence (line 78) ... FAILED
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::char_to_int (line 53) ... FAILED
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 47) ... FAILED
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 6) ... FAILED
[INFO] [stdout] test src/sequence/combined.rs - sequence::combined::CombinedSequence::reset (line 64) ... FAILED
[INFO] [stdout] test src/sequence/combined.rs - sequence::combined::CombinedSequence (line 16) ... ok
[INFO] [stdout] test src/lib.rs - derive_builder (line 55) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 223) ... ok
[INFO] [stdout] test src/lib.rs - derive_builder (line 13) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 27) ... ok
[INFO] [stdout] test src/sequence/combined.rs - sequence::combined::CombinedSequence::zero (line 84) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::SeqRenderer::render (line 73) ... ok
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::int_to_string (line 6) ... ok
[INFO] [stdout] test src/sequence/combined.rs - sequence::combined::CombinedSequence::next (line 113) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::RenderDisplay (line 21) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::max_numeric (line 183) ... ok
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::string_to_int (line 70) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::max_alpha (line 164) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - derive_builder (line 36) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/sequence/helper.rs - sequence::helper::int_to_char (line 36) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/sequence/builder.rs - sequence::builder::SequenceBuilder::max_render_capacity (line 141) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 61) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/sequence.rs - sequence::Sequence (line 78) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/sequence/helper.rs - sequence::helper::char_to_int (line 53) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 47) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 6) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/sequence/combined.rs - sequence::combined::CombinedSequence::reset (line 64) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - derive_builder (line 36)
[INFO] [stdout]     src/sequence.rs - sequence::Sequence (line 78)
[INFO] [stdout]     src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 47)
[INFO] [stdout]     src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 6)
[INFO] [stdout]     src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 61)
[INFO] [stdout]     src/sequence/builder.rs - sequence::builder::SequenceBuilder::max_render_capacity (line 141)
[INFO] [stdout]     src/sequence/combined.rs - sequence::combined::CombinedSequence::reset (line 64)
[INFO] [stdout]     src/sequence/helper.rs - sequence::helper::char_to_int (line 53)
[INFO] [stdout]     src/sequence/helper.rs - sequence::helper::int_to_char (line 36)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 13 passed; 9 failed; 0 ignored; 0 measured; 0 filtered out; finished in 15.43s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53", kill_on_drop: false }`
[INFO] [stdout] a12f0f03c8b48e6fa3940f4afdb3c7a86bff23ba70a7ef322087a87b0b6a4f53
