[INFO] fetching crate lain 0.5.5...
[INFO] checking lain-0.5.5 against 1.95.0 for pr-155915
[INFO] extracting crate lain 0.5.5 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate lain 0.5.5
[INFO] finished tweaking crates.io crate lain 0.5.5
[INFO] tweaked toml for crates.io crate lain 0.5.5 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate lain 0.5.5 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 41 packages to latest compatible versions
[INFO] [stderr]       Adding num v0.2.1 (available: v0.4.3)
[INFO] [stderr]       Adding num-derive v0.2.5 (available: v0.4.2)
[INFO] [stderr]       Adding rand v0.7.3 (available: v0.10.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lain_derive v0.5.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 010aada7109685934031eed53ea465de07d1590919271ea77a80e0a2decc92de
[INFO] running `Command { std: "docker" "start" "-a" "010aada7109685934031eed53ea465de07d1590919271ea77a80e0a2decc92de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "010aada7109685934031eed53ea465de07d1590919271ea77a80e0a2decc92de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "010aada7109685934031eed53ea465de07d1590919271ea77a80e0a2decc92de", kill_on_drop: false }`
[INFO] [stdout] 010aada7109685934031eed53ea465de07d1590919271ea77a80e0a2decc92de
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5dbc1e8748543d310a3b15cef74a63cc4b44203a1dcd7e525efb508b727f1948
[INFO] running `Command { std: "docker" "start" "-a" "5dbc1e8748543d310a3b15cef74a63cc4b44203a1dcd7e525efb508b727f1948", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling field-offset v0.3.6
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling lain_derive v0.5.5
[INFO] [stderr]     Checking lain v0.5.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:101:1
[INFO] [stdout]     |
[INFO] [stdout] 101 | #![feature(specialization)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: the feature `min_const_generics` has been stable since `1.51.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]    --> src/lib.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 | #![feature(specialization)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]     = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy`
[INFO] [stdout]   --> src/mutatable.rs:14:23
[INFO] [stdout]    |
[INFO] [stdout] 14 | #[derive(Copy, Clone, NewFuzzed, PartialEq)]
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default_features`, `serde`, and `serde_support`
[INFO] [stdout]    = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `NewFuzzed` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the derive macro `NewFuzzed` may come from an old version of the `lain_derive` crate, try updating your dependency with `cargo update -p lain_derive`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout]    = note: this warning originates in the derive macro `NewFuzzed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy`
[INFO] [stdout]   --> src/mutatable.rs:23:23
[INFO] [stdout]    |
[INFO] [stdout] 23 | #[derive(Copy, Clone, NewFuzzed)]
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default_features`, `serde`, and `serde_support`
[INFO] [stdout]    = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `NewFuzzed` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the derive macro `NewFuzzed` may come from an old version of the `lain_derive` crate, try updating your dependency with `cargo update -p lain_derive`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: this warning originates in the derive macro `NewFuzzed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy`
[INFO] [stdout]   --> src/mutatable.rs:29:34
[INFO] [stdout]    |
[INFO] [stdout] 29 | #[derive(Copy, Clone, PartialEq, NewFuzzed)]
[INFO] [stdout]    |                                  ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default_features`, `serde`, and `serde_support`
[INFO] [stdout]    = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `NewFuzzed` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the derive macro `NewFuzzed` may come from an old version of the `lain_derive` crate, try updating your dependency with `cargo update -p lain_derive`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: this warning originates in the derive macro `NewFuzzed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy`
[INFO] [stdout]   --> src/mutator.rs:23:30
[INFO] [stdout]    |
[INFO] [stdout] 23 | #[derive(Debug, Copy, Clone, NewFuzzed)]
[INFO] [stdout]    |                              ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default_features`, `serde`, and `serde_support`
[INFO] [stdout]    = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `NewFuzzed` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the derive macro `NewFuzzed` may come from an old version of the `lain_derive` crate, try updating your dependency with `cargo update -p lain_derive`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: this warning originates in the derive macro `NewFuzzed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:101:1
[INFO] [stdout]     |
[INFO] [stdout] 101 | #![feature(specialization)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: the feature `min_const_generics` has been stable since `1.51.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]    --> src/lib.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 | #![feature(specialization)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]     = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy`
[INFO] [stdout]   --> src/mutatable.rs:14:23
[INFO] [stdout]    |
[INFO] [stdout] 14 | #[derive(Copy, Clone, NewFuzzed, PartialEq)]
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default_features`, `serde`, and `serde_support`
[INFO] [stdout]    = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `NewFuzzed` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the derive macro `NewFuzzed` may come from an old version of the `lain_derive` crate, try updating your dependency with `cargo update -p lain_derive`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout]    = note: this warning originates in the derive macro `NewFuzzed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy`
[INFO] [stdout]   --> src/mutatable.rs:23:23
[INFO] [stdout]    |
[INFO] [stdout] 23 | #[derive(Copy, Clone, NewFuzzed)]
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default_features`, `serde`, and `serde_support`
[INFO] [stdout]    = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `NewFuzzed` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the derive macro `NewFuzzed` may come from an old version of the `lain_derive` crate, try updating your dependency with `cargo update -p lain_derive`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: this warning originates in the derive macro `NewFuzzed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy`
[INFO] [stdout]   --> src/mutatable.rs:29:34
[INFO] [stdout]    |
[INFO] [stdout] 29 | #[derive(Copy, Clone, PartialEq, NewFuzzed)]
[INFO] [stdout]    |                                  ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default_features`, `serde`, and `serde_support`
[INFO] [stdout]    = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `NewFuzzed` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the derive macro `NewFuzzed` may come from an old version of the `lain_derive` crate, try updating your dependency with `cargo update -p lain_derive`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: this warning originates in the derive macro `NewFuzzed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy`
[INFO] [stdout]   --> src/mutator.rs:23:30
[INFO] [stdout]    |
[INFO] [stdout] 23 | #[derive(Debug, Copy, Clone, NewFuzzed)]
[INFO] [stdout]    |                              ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default_features`, `serde`, and `serde_support`
[INFO] [stdout]    = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `NewFuzzed` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the derive macro `NewFuzzed` may come from an old version of the `lain_derive` crate, try updating your dependency with `cargo update -p lain_derive`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: this warning originates in the derive macro `NewFuzzed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable
[INFO] [stdout]    --> src/lib.rs:102:12
[INFO] [stdout]     |
[INFO] [stdout] 102 | #![feature(min_const_generics)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable
[INFO] [stdout]    --> src/lib.rs:102:12
[INFO] [stdout]     |
[INFO] [stdout] 102 | #![feature(min_const_generics)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mutatable.rs:319:13
[INFO] [stdout]     |
[INFO] [stdout] 319 |         let mut constraints = constraints.and_then(|c| {
[INFO] [stdout]     |             ----^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mutatable.rs:635:25
[INFO] [stdout]     |
[INFO] [stdout] 635 |                     let mut new_item = T::new_fuzzed(mutator, constraints);
[INFO] [stdout]     |                         ----^^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/new_fuzzed.rs:777:25
[INFO] [stdout]     |
[INFO] [stdout] 777 |                       let mut per_item_max_size: Option<usize> = constraints.and_then(|c| c.max_size.as_ref().and_then(|size| Some(...
[INFO] [stdout]     |                           ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 858 | / impl_new_fuzzed_array!(
[INFO] [stdout] 859 | |     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
[INFO] [stdout] 860 | |     27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
[INFO] [stdout] 861 | |     51, 52, 53, 54, 55, 56, 57, 58, 59, 60
[INFO] [stdout] 862 | | );
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `impl_new_fuzzed_array` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/new_fuzzed.rs:831:25
[INFO] [stdout]     |
[INFO] [stdout] 831 |                       let mut per_item_max_size: Option<usize> = constraints.and_then(|c| c.max_size.as_ref().and_then(|size| Some(...
[INFO] [stdout]     |                           ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 858 | / impl_new_fuzzed_array!(
[INFO] [stdout] 859 | |     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
[INFO] [stdout] 860 | |     27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
[INFO] [stdout] 861 | |     51, 52, 53, 54, 55, 56, 57, 58, 59, 60
[INFO] [stdout] 862 | | );
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `impl_new_fuzzed_array` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mutatable.rs:319:13
[INFO] [stdout]     |
[INFO] [stdout] 319 |         let mut constraints = constraints.and_then(|c| {
[INFO] [stdout]     |             ----^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mutatable.rs:635:25
[INFO] [stdout]     |
[INFO] [stdout] 635 |                     let mut new_item = T::new_fuzzed(mutator, constraints);
[INFO] [stdout]     |                         ----^^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/new_fuzzed.rs:777:25
[INFO] [stdout]     |
[INFO] [stdout] 777 |                       let mut per_item_max_size: Option<usize> = constraints.and_then(|c| c.max_size.as_ref().and_then(|size| Some(...
[INFO] [stdout]     |                           ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 858 | / impl_new_fuzzed_array!(
[INFO] [stdout] 859 | |     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
[INFO] [stdout] 860 | |     27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
[INFO] [stdout] 861 | |     51, 52, 53, 54, 55, 56, 57, 58, 59, 60
[INFO] [stdout] 862 | | );
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `impl_new_fuzzed_array` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/new_fuzzed.rs:831:25
[INFO] [stdout]     |
[INFO] [stdout] 831 |                       let mut per_item_max_size: Option<usize> = constraints.and_then(|c| c.max_size.as_ref().and_then(|size| Some(...
[INFO] [stdout]     |                           ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 858 | / impl_new_fuzzed_array!(
[INFO] [stdout] 859 | |     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
[INFO] [stdout] 860 | |     27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
[INFO] [stdout] 861 | |     51, 52, 53, 54, 55, 56, 57, 58, 59, 60
[INFO] [stdout] 862 | | );
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `impl_new_fuzzed_array` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lain` (lib test) due to 1 previous error; 10 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lain` (lib) due to 1 previous error; 10 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "5dbc1e8748543d310a3b15cef74a63cc4b44203a1dcd7e525efb508b727f1948", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5dbc1e8748543d310a3b15cef74a63cc4b44203a1dcd7e525efb508b727f1948", kill_on_drop: false }`
[INFO] [stdout] 5dbc1e8748543d310a3b15cef74a63cc4b44203a1dcd7e525efb508b727f1948
