[INFO] fetching crate content-tree 0.2.0...
[INFO] checking content-tree-0.2.0 against try#173780a87744406b7489b28349c0176f14bb3881 for pr-135841
[INFO] extracting crate content-tree 0.2.0 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate content-tree 0.2.0 on toolchain 173780a87744406b7489b28349c0176f14bb3881
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+173780a87744406b7489b28349c0176f14bb3881" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate content-tree 0.2.0
[INFO] finished tweaking crates.io crate content-tree 0.2.0
[INFO] tweaked toml for crates.io crate content-tree 0.2.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate crates.io crate content-tree 0.2.0 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" "+173780a87744406b7489b28349c0176f14bb3881" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+173780a87744406b7489b28349c0176f14bb3881" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dfc014c07c82b53a33a545bb909b319c5f20084ee78dde4f6a5df8cd69277005
[INFO] running `Command { std: "docker" "start" "-a" "dfc014c07c82b53a33a545bb909b319c5f20084ee78dde4f6a5df8cd69277005", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dfc014c07c82b53a33a545bb909b319c5f20084ee78dde4f6a5df8cd69277005", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfc014c07c82b53a33a545bb909b319c5f20084ee78dde4f6a5df8cd69277005", kill_on_drop: false }`
[INFO] [stdout] dfc014c07c82b53a33a545bb909b319c5f20084ee78dde4f6a5df8cd69277005
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+173780a87744406b7489b28349c0176f14bb3881" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8236fdd827fe23f74e8f8ac8d30aaf8f852d096b37908fb5652f882e36251d4a
[INFO] running `Command { std: "docker" "start" "-a" "8236fdd827fe23f74e8f8ac8d30aaf8f852d096b37908fb5652f882e36251d4a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking smallvec v1.9.0
[INFO] [stderr]     Checking humansize v1.1.1
[INFO] [stderr]     Checking rle v0.2.0
[INFO] [stderr]     Checking content-tree v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/mutations.rs:1066:25
[INFO] [stdout]      |
[INFO] [stdout] 1066 |                     let mut root = root.as_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] [stderr]     Checking getrandom v0.2.7
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/mutations.rs:1066:25
[INFO] [stdout]      |
[INFO] [stdout] 1066 |                     let mut root = root.as_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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.44s
[INFO] running `Command { std: "docker" "inspect" "8236fdd827fe23f74e8f8ac8d30aaf8f852d096b37908fb5652f882e36251d4a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8236fdd827fe23f74e8f8ac8d30aaf8f852d096b37908fb5652f882e36251d4a", kill_on_drop: false }`
[INFO] [stdout] 8236fdd827fe23f74e8f8ac8d30aaf8f852d096b37908fb5652f882e36251d4a