[INFO] fetching crate fret-diag 0.1.0...
[INFO] checking fret-diag-0.1.0 against try#6757d700f93f6d16c8b39cf79e96b019bd570e7d for pr-155299-1
[INFO] extracting crate fret-diag 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate fret-diag 0.1.0
[INFO] finished tweaking crates.io crate fret-diag 0.1.0
[INFO] tweaked toml for crates.io crate fret-diag 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate fret-diag 0.1.0 on toolchain 6757d700f93f6d16c8b39cf79e96b019bd570e7d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6757d700f93f6d16c8b39cf79e96b019bd570e7d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate fret-diag 0.1.0 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" "+6757d700f93f6d16c8b39cf79e96b019bd570e7d" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+6757d700f93f6d16c8b39cf79e96b019bd570e7d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1872db0048e5f1ba1c978fc4b62afa9e802e59737d09f2195ee8c6718082addf
[INFO] running `Command { std: "docker" "start" "-a" "1872db0048e5f1ba1c978fc4b62afa9e802e59737d09f2195ee8c6718082addf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1872db0048e5f1ba1c978fc4b62afa9e802e59737d09f2195ee8c6718082addf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1872db0048e5f1ba1c978fc4b62afa9e802e59737d09f2195ee8c6718082addf", kill_on_drop: false }`
[INFO] [stdout] 1872db0048e5f1ba1c978fc4b62afa9e802e59737d09f2195ee8c6718082addf
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+6757d700f93f6d16c8b39cf79e96b019bd570e7d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 878917851f83ba086a8e32f98519a7c7c0615b432179e48a4b1ddee657ae290f
[INFO] running `Command { std: "docker" "start" "-a" "878917851f83ba086a8e32f98519a7c7c0615b432179e48a4b1ddee657ae290f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
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[INFO] [stderr]     Checking smol_str v0.2.2
[INFO] [stderr]     Checking keyboard-types v0.8.3
[INFO] [stderr]     Checking fret-core v0.1.0
[INFO] [stderr]     Checking idna_adapter v1.2.1
[INFO] [stderr]     Checking idna v1.1.0
[INFO] [stderr]     Checking url v2.5.8
[INFO] [stderr]     Checking fret-diag-protocol v0.1.0
[INFO] [stderr]     Checking fret-diag-ws v0.1.0
[INFO] [stderr]     Checking fret-diag v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/compare.rs:1711:17
[INFO] [stdout]      |
[INFO] [stdout] 1711 |             let mut footprint = collect_demo_footprint_json(demo, false, {
[INFO] [stdout]      |                 ----^^^^^^^^^
[INFO] [stdout]      |                 |
[INFO] [stdout]      |                 help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/compare.rs:1764:9
[INFO] [stdout]      |
[INFO] [stdout] 1764 |     let mut footprint = collect_demo_footprint_json(demo, true, {
[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/compare.rs:1711:17
[INFO] [stdout]      |
[INFO] [stdout] 1711 |             let mut footprint = collect_demo_footprint_json(demo, false, {
[INFO] [stdout]      |                 ----^^^^^^^^^
[INFO] [stdout]      |                 |
[INFO] [stdout]      |                 help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/compare.rs:1764:9
[INFO] [stdout]      |
[INFO] [stdout] 1764 |     let mut footprint = collect_demo_footprint_json(demo, true, {
[INFO] [stdout]      |         ----^^^^^^^^^
[INFO] [stdout]      |         |
[INFO] [stdout]      |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 07s
[INFO] running `Command { std: "docker" "inspect" "878917851f83ba086a8e32f98519a7c7c0615b432179e48a4b1ddee657ae290f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "878917851f83ba086a8e32f98519a7c7c0615b432179e48a4b1ddee657ae290f", kill_on_drop: false }`
[INFO] [stdout] 878917851f83ba086a8e32f98519a7c7c0615b432179e48a4b1ddee657ae290f