[INFO] fetching crate mice 0.10.4...
[INFO] checking mice-0.10.4 against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] extracting crate mice 0.10.4 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate mice 0.10.4 on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mice 0.10.4
[INFO] finished tweaking crates.io crate mice 0.10.4
[INFO] tweaked toml for crates.io crate mice 0.10.4 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded derive-syn-parse v0.1.5
[INFO] [stderr]   Downloaded mbot_proc_macro_helpers v0.0.1
[INFO] [stderr]   Downloaded core_extensions v1.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 90240201ad8165b8c26030f8f843184648cf49598a977eae22dfd167635cc415
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "90240201ad8165b8c26030f8f843184648cf49598a977eae22dfd167635cc415", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "90240201ad8165b8c26030f8f843184648cf49598a977eae22dfd167635cc415", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90240201ad8165b8c26030f8f843184648cf49598a977eae22dfd167635cc415", kill_on_drop: false }`
[INFO] [stdout] 90240201ad8165b8c26030f8f843184648cf49598a977eae22dfd167635cc415
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2a0c321f99734a7838e9526da805c1464199f500e66a190bd211a1c2e60b42db
[INFO] running `Command { std: "docker" "start" "-a" "2a0c321f99734a7838e9526da805c1464199f500e66a190bd211a1c2e60b42db", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr] note: Switching to Edition 2021 will enable the use of the version 2 feature resolver in Cargo.
[INFO] [stderr] This may cause some dependencies to be built with fewer features enabled than previously.
[INFO] [stderr] More information about the resolver changes may be found at https://doc.rust-lang.org/nightly/edition-guide/rust-2021/default-cargo-resolver.html
[INFO] [stderr] When building the following dependencies, the given features will no longer be used:
[INFO] [stderr] 
[INFO] [stderr]   libc v0.2.100: default, std
[INFO] [stderr]   rand v0.7.3: rand_pcg, small_rng
[INFO] [stderr]   syn v1.0.75 (as host dependency): full
[INFO] [stderr] 
[INFO] [stderr]    Compiling syn v1.0.75
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]    Compiling serde_derive v1.0.128
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking plotters-backend v0.3.2
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]     Checking core_extensions v1.4.2
[INFO] [stderr]     Checking id-arena v2.2.1
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking plotters-svg v0.3.1
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking checked v0.5.0
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking plotters v0.3.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking bstr v0.2.16
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking criterion-plot v0.4.4
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling derive-syn-parse v0.1.5
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]    Compiling derive_more v0.99.16
[INFO] [stderr]     Checking thiserror v1.0.26
[INFO] [stderr]    Compiling mbot_proc_macro_helpers v0.0.1
[INFO] [stderr]     Checking mice v0.10.4 (/tmp/fixit)
[INFO] [stderr]    Migrating src/lib.rs from 2018 edition to 2021
[INFO] [stderr]     Checking criterion v0.3.5
[INFO] [stderr]    Migrating benches/rolling.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating benches/formatting.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating benches/tree.rs from 2018 edition to 2021
[INFO] [stdout] warning: struct is never constructed: `StackProgram`
[INFO] [stdout]   --> benches/tree.rs:40:20
[INFO] [stdout]    |
[INFO] [stdout] 40 |         pub struct StackProgram(Vec<Instruction>);
[INFO] [stdout]    |                    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `count`
[INFO] [stdout]   --> benches/tree.rs:47:17
[INFO] [stdout]    |
[INFO] [stdout] 47 |                 count: i64,
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sides`
[INFO] [stdout]   --> benches/tree.rs:48:17
[INFO] [stdout]    |
[INFO] [stdout] 48 |                 sides: i64,
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `keep_count`
[INFO] [stdout]   --> benches/tree.rs:49:17
[INFO] [stdout]    |
[INFO] [stdout] 49 |                 keep_count: i64,
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 13s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]    Compiling syn v1.0.75
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]    Compiling derive-syn-parse v0.1.5
[INFO] [stderr]    Compiling serde_derive v1.0.128
[INFO] [stderr]    Compiling derive_more v0.99.16
[INFO] [stderr]     Checking thiserror v1.0.26
[INFO] [stderr]    Compiling mbot_proc_macro_helpers v0.0.1
[INFO] [stderr]     Checking mice v0.10.4 (/tmp/fixit)
[INFO] [stderr]     Checking criterion v0.3.5
[INFO] [stdout] warning: struct is never constructed: `StackProgram`
[INFO] [stdout]   --> benches/tree.rs:40:20
[INFO] [stdout]    |
[INFO] [stdout] 40 |         pub struct StackProgram(Vec<Instruction>);
[INFO] [stdout]    |                    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `count`
[INFO] [stdout]   --> benches/tree.rs:47:17
[INFO] [stdout]    |
[INFO] [stdout] 47 |                 count: i64,
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sides`
[INFO] [stdout]   --> benches/tree.rs:48:17
[INFO] [stdout]    |
[INFO] [stdout] 48 |                 sides: i64,
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `keep_count`
[INFO] [stdout]   --> benches/tree.rs:49:17
[INFO] [stdout]    |
[INFO] [stdout] 49 |                 keep_count: i64,
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 42.25s
[INFO] running `Command { std: "docker" "inspect" "2a0c321f99734a7838e9526da805c1464199f500e66a190bd211a1c2e60b42db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a0c321f99734a7838e9526da805c1464199f500e66a190bd211a1c2e60b42db", kill_on_drop: false }`
[INFO] [stdout] 2a0c321f99734a7838e9526da805c1464199f500e66a190bd211a1c2e60b42db