[INFO] fetching crate content-tree 0.2.0...
[INFO] building content-tree-0.2.0 against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] extracting crate content-tree 0.2.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate content-tree 0.2.0 on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "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-0-tc1/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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded humansize v1.1.1
[INFO] [stderr]   Downloaded rle v0.2.0
[INFO] [stderr]   Downloaded smallvec v1.9.0
[INFO] [stderr]   Downloaded libc v0.2.132
[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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aa1cb5feb2a7442fd9b897526fd4e6a63eb6db6f1d25fd25af242f6cb21b5e10
[INFO] running `Command { std: "docker" "start" "-a" "aa1cb5feb2a7442fd9b897526fd4e6a63eb6db6f1d25fd25af242f6cb21b5e10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa1cb5feb2a7442fd9b897526fd4e6a63eb6db6f1d25fd25af242f6cb21b5e10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa1cb5feb2a7442fd9b897526fd4e6a63eb6db6f1d25fd25af242f6cb21b5e10", kill_on_drop: false }`
[INFO] [stdout] aa1cb5feb2a7442fd9b897526fd4e6a63eb6db6f1d25fd25af242f6cb21b5e10
[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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 27ceb9007c40a3dbc90c43aaf6f44db7a07eedc2da802ffbcb41efd8e832e03e
[INFO] running `Command { std: "docker" "start" "-a" "27ceb9007c40a3dbc90c43aaf6f44db7a07eedc2da802ffbcb41efd8e832e03e", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v1.9.0
[INFO] [stderr]    Compiling humansize v1.1.1
[INFO] [stderr]    Compiling rle v0.2.0
[INFO] [stderr]    Compiling 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]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `Command { std: "docker" "inspect" "27ceb9007c40a3dbc90c43aaf6f44db7a07eedc2da802ffbcb41efd8e832e03e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27ceb9007c40a3dbc90c43aaf6f44db7a07eedc2da802ffbcb41efd8e832e03e", kill_on_drop: false }`
[INFO] [stdout] 27ceb9007c40a3dbc90c43aaf6f44db7a07eedc2da802ffbcb41efd8e832e03e
[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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d01c889b495b32cf9f9e566e8ba75d1bd293d6c464d01c8114c0c8905532c849
[INFO] running `Command { std: "docker" "start" "-a" "d01c889b495b32cf9f9e566e8ba75d1bd293d6c464d01c8114c0c8905532c849", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling ppv-lite86 v0.2.16
[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]    Compiling getrandom v0.2.7
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling 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]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.97s
[INFO] running `Command { std: "docker" "inspect" "d01c889b495b32cf9f9e566e8ba75d1bd293d6c464d01c8114c0c8905532c849", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d01c889b495b32cf9f9e566e8ba75d1bd293d6c464d01c8114c0c8905532c849", kill_on_drop: false }`
[INFO] [stdout] d01c889b495b32cf9f9e566e8ba75d1bd293d6c464d01c8114c0c8905532c849