[INFO] fetching crate convenient-skiplist 1.0.3...
[INFO] checking convenient-skiplist-1.0.3 against try#a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399 for pr-145770
[INFO] extracting crate convenient-skiplist 1.0.3 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate convenient-skiplist 1.0.3
[INFO] finished tweaking crates.io crate convenient-skiplist 1.0.3
[INFO] tweaked toml for crates.io crate convenient-skiplist 1.0.3 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate convenient-skiplist 1.0.3 on toolchain a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate convenient-skiplist 1.0.3 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" "+a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3752638e087dffb52b644171c279dc393f03e61dfecb86ae387bd81fc6cd8e08
[INFO] running `Command { std: "docker" "start" "-a" "3752638e087dffb52b644171c279dc393f03e61dfecb86ae387bd81fc6cd8e08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3752638e087dffb52b644171c279dc393f03e61dfecb86ae387bd81fc6cd8e08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3752638e087dffb52b644171c279dc393f03e61dfecb86ae387bd81fc6cd8e08", kill_on_drop: false }`
[INFO] [stdout] 3752638e087dffb52b644171c279dc393f03e61dfecb86ae387bd81fc6cd8e08
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b8537e167c49c56812cf448fe4def0beb86365b8fb21b8900e67314dcde28774
[INFO] running `Command { std: "docker" "start" "-a" "b8537e167c49c56812cf448fe4def0beb86365b8fb21b8900e67314dcde28774", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling rayon-core v1.7.1
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking half v1.6.0
[INFO] [stderr]     Checking oorandom v11.1.2
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling rayon v1.3.1
[INFO] [stderr]     Checking clap v2.33.2
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking criterion-plot v0.4.3
[INFO] [stderr]     Checking rand_core v0.5.1
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[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
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[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking plotters v0.2.15
[INFO] [stderr]     Checking convenient-skiplist v1.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:761:13
[INFO] [stdout]     |
[INFO] [stdout] 761 |         for mut nw in frontier.into_iter().rev().skip(1) {
[INFO] [stdout]     |             ----^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:935:21
[INFO] [stdout]     |
[INFO] [stdout] 935 |     pub fn iter_all(&self) -> IterAll<T> {
[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] 935 |     pub fn iter_all(&self) -> IterAll<'_, T> {
[INFO] [stdout]     |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]     --> src/lib.rs:1025:26
[INFO] [stdout]      |
[INFO] [stdout] 1025 |     pub fn range_with<F>(&self, inclusive_fn: F) -> IterRangeWith<T, F>
[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] 1025 |     pub fn range_with<F>(&self, inclusive_fn: F) -> IterRangeWith<'_, T, F>
[INFO] [stdout]      |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking bstr v0.2.13
[INFO] [stderr]     Checking serde_cbor v0.11.1
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]     Checking tinytemplate v1.1.0
[INFO] [stderr]    Compiling checkers-macros v0.5.1
[INFO] [stderr]     Checking checkers v0.5.6
[INFO] [stderr]     Checking criterion v0.3.3
[INFO] [stdout] error[E0599]: no method named `item_smaller_than_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:718:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_smaller_than_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 718 |         assert!(srw.item_smaller_than_range(&NodeValue::Value(1)) == true);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_smaller_than_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:719:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_smaller_than_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 719 |         assert!(srw.item_smaller_than_range(&NodeValue::Value(2)) == false);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_smaller_than_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:720:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_smaller_than_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 720 |         assert!(srw.item_smaller_than_range(&NodeValue::Value(4)) == false);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_smaller_than_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:721:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_smaller_than_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 721 |         assert!(srw.item_smaller_than_range(&NodeValue::Value(5)) == false);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_smaller_than_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:722:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_smaller_than_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 722 |         assert!(srw.item_smaller_than_range(&NodeValue::NegInf) == true);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_smaller_than_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:723:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_smaller_than_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 723 |         assert!(srw.item_smaller_than_range(&NodeValue::PosInf) == false);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_in_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:725:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_in_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 725 |         assert!(srw.item_in_range(&NodeValue::Value(1)) == false);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_in_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:726:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_in_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 726 |         assert!(srw.item_in_range(&NodeValue::Value(2)) == true);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_in_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:727:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_in_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 727 |         assert!(srw.item_in_range(&NodeValue::Value(3)) == true);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_in_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:728:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_in_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 728 |         assert!(srw.item_in_range(&NodeValue::Value(4)) == true);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_in_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:729:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_in_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 729 |         assert!(srw.item_in_range(&NodeValue::Value(5)) == false);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_in_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:730:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_in_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 730 |         assert!(srw.item_in_range(&NodeValue::PosInf) == false);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `item_in_range` found for struct `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>` in the current scope
[INFO] [stdout]    --> src/iter.rs:731:21
[INFO] [stdout]     |
[INFO] [stdout] 525 | pub struct IterRangeWith<'a, T, F>
[INFO] [stdout]     | ---------------------------------- method `item_in_range` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 731 |         assert!(srw.item_in_range(&NodeValue::NegInf) == false);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^ method not found in `IterRangeWith<'_, {integer}, {closure@src/iter.rs:709:42: 709:46}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method was found for
[INFO] [stdout]             - `IterRangeWith<'a, T, F>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:761:13
[INFO] [stdout]     |
[INFO] [stdout] 761 |         for mut nw in frontier.into_iter().rev().skip(1) {
[INFO] [stdout]     |             ----^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `convenient-skiplist` (lib test) due to 13 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "b8537e167c49c56812cf448fe4def0beb86365b8fb21b8900e67314dcde28774", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8537e167c49c56812cf448fe4def0beb86365b8fb21b8900e67314dcde28774", kill_on_drop: false }`
[INFO] [stdout] b8537e167c49c56812cf448fe4def0beb86365b8fb21b8900e67314dcde28774
