[INFO] fetching crate neat-gru 1.4.0...
[INFO] checking neat-gru-1.4.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate neat-gru 1.4.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate neat-gru 1.4.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate neat-gru 1.4.0
[INFO] finished tweaking crates.io crate neat-gru 1.4.0
[INFO] tweaked toml for crates.io crate neat-gru 1.4.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate neat-gru 1.4.0 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded semver v1.0.4
[INFO] [stderr]   Downloaded num-complex v0.4.0
[INFO] [stderr]   Downloaded numeric_literals v0.2.0
[INFO] [stderr]   Downloaded rand_distr v0.4.2
[INFO] [stderr]   Downloaded num-rational v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 367d68b20d65fe3578cdd8e57c5f0ac645152743d14927b7bc79b0d265b04605
[INFO] running `Command { std: "docker" "start" "-a" "367d68b20d65fe3578cdd8e57c5f0ac645152743d14927b7bc79b0d265b04605", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "367d68b20d65fe3578cdd8e57c5f0ac645152743d14927b7bc79b0d265b04605", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "367d68b20d65fe3578cdd8e57c5f0ac645152743d14927b7bc79b0d265b04605", kill_on_drop: false }`
[INFO] [stdout] 367d68b20d65fe3578cdd8e57c5f0ac645152743d14927b7bc79b0d265b04605
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0b8e9566730d1850f9a87dc3b4e7ca6c44cc2bb3fd1fec4057e866c18d3cb15
[INFO] running `Command { std: "docker" "start" "-a" "d0b8e9566730d1850f9a87dc3b4e7ca6c44cc2bb3fd1fec4057e866c18d3cb15", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.34
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]    Compiling syn v1.0.83
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling serde_derive v1.0.132
[INFO] [stderr]    Compiling serde v1.0.132
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling serde_json v1.0.73
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]     Checking plotters-backend v0.3.2
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]    Compiling async-trait v0.1.52
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
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[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking plotters v0.3.1
[INFO] [stderr]     Checking criterion-plot v0.4.4
[INFO] [stderr]     Checking rand_distr v0.4.2
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]    Compiling numeric_literals v0.2.0
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking neat-gru v1.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking criterion v0.3.5
[INFO] [stdout] warning: the item `Distribution` is imported redundantly
[INFO] [stdout]   --> src/topology/topology_struct.rs:11:18
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rand::prelude::*;
[INFO] [stdout]    |     ---------------- the item `Distribution` is already imported here
[INFO] [stdout] 11 | use rand_distr::{Distribution, Normal};
[INFO] [stdout]    |                  ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/topology/topology_struct.rs:319:17
[INFO] [stdout]     |
[INFO] [stdout] 319 |             let mut gene = &mut *gene_rc.borrow_mut();
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/topology/topology_struct.rs:360:17
[INFO] [stdout]     |
[INFO] [stdout] 360 |             let mut gene = &mut *gene_to_split.borrow_mut();
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Distribution` is imported redundantly
[INFO] [stdout]   --> src/topology/topology_struct.rs:11:18
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rand::prelude::*;
[INFO] [stdout]    |     ---------------- the item `Distribution` is already imported here
[INFO] [stdout] 11 | use rand_distr::{Distribution, Normal};
[INFO] [stdout]    |                  ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/topology/topology_struct.rs:319:17
[INFO] [stdout]     |
[INFO] [stdout] 319 |             let mut gene = &mut *gene_rc.borrow_mut();
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/topology/topology_struct.rs:360:17
[INFO] [stdout]     |
[INFO] [stdout] 360 |             let mut gene = &mut *gene_to_split.borrow_mut();
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 17.61s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.3.5
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 3`
[INFO] running `Command { std: "docker" "inspect" "d0b8e9566730d1850f9a87dc3b4e7ca6c44cc2bb3fd1fec4057e866c18d3cb15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0b8e9566730d1850f9a87dc3b4e7ca6c44cc2bb3fd1fec4057e866c18d3cb15", kill_on_drop: false }`
[INFO] [stdout] d0b8e9566730d1850f9a87dc3b4e7ca6c44cc2bb3fd1fec4057e866c18d3cb15