[INFO] fetching crate demes 0.4.0...
[INFO] checking demes-0.4.0 against master#e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682 for beta-170-4
[INFO] extracting crate demes 0.4.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate demes 0.4.0 on toolchain e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate demes 0.4.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate demes 0.4.0
[INFO] tweaked toml for crates.io crate demes 0.4.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate demes 0.4.0 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" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 550c0bc4e27d03793b530ab643bebad682259ba22832985a3bfdd43c2d64dc2d
[INFO] running `Command { std: "docker" "start" "-a" "550c0bc4e27d03793b530ab643bebad682259ba22832985a3bfdd43c2d64dc2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "550c0bc4e27d03793b530ab643bebad682259ba22832985a3bfdd43c2d64dc2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "550c0bc4e27d03793b530ab643bebad682259ba22832985a3bfdd43c2d64dc2d", kill_on_drop: false }`
[INFO] [stdout] 550c0bc4e27d03793b530ab643bebad682259ba22832985a3bfdd43c2d64dc2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 63f6d88f8bed88baa462030969144465a1a812310c9bec185c334504fd21cc9f
[INFO] running `Command { std: "docker" "start" "-a" "63f6d88f8bed88baa462030969144465a1a812310c9bec185c334504fd21cc9f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]     Checking unsafe-libyaml v0.2.5
[INFO] [stderr]    Compiling anyhow v1.0.69
[INFO] [stderr]     Checking regex-syntax v0.6.28
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]     Checking regex v1.7.1
[INFO] [stderr]    Compiling serde_derive v1.0.152
[INFO] [stderr]    Compiling thiserror-impl v1.0.38
[INFO] [stderr]     Checking thiserror v1.0.38
[INFO] [stderr]     Checking serde_yaml v0.9.17
[INFO] [stderr]     Checking demes v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/specification.rs:1357:13
[INFO] [stdout]      |
[INFO] [stdout] 1357 |         let mut last_epoch_ref = self
[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/specification.rs:1414:17
[INFO] [stdout]      |
[INFO] [stdout] 1414 |             let mut temp_epoch = self.epochs.get_mut(0).ok_or_else(|| {
[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/specification.rs:1357:13
[INFO] [stdout]      |
[INFO] [stdout] 1357 |         let mut last_epoch_ref = self
[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/specification.rs:1414:17
[INFO] [stdout]      |
[INFO] [stdout] 1414 |             let mut temp_epoch = self.epochs.get_mut(0).ok_or_else(|| {
[INFO] [stdout]      |                 ----^^^^^^^^^^
[INFO] [stdout]      |                 |
[INFO] [stdout]      |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.79s
[INFO] running `Command { std: "docker" "inspect" "63f6d88f8bed88baa462030969144465a1a812310c9bec185c334504fd21cc9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63f6d88f8bed88baa462030969144465a1a812310c9bec185c334504fd21cc9f", kill_on_drop: false }`
[INFO] [stdout] 63f6d88f8bed88baa462030969144465a1a812310c9bec185c334504fd21cc9f
