[INFO] fetching crate twiggy-ir 0.7.0...
[INFO] checking twiggy-ir-0.7.0 against master#9bfa31f632912180dc742809bcc51a97f2d7079d for pr-140151
[INFO] extracting crate twiggy-ir 0.7.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate twiggy-ir 0.7.0 on toolchain 9bfa31f632912180dc742809bcc51a97f2d7079d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9bfa31f632912180dc742809bcc51a97f2d7079d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate twiggy-ir 0.7.0
[INFO] finished tweaking crates.io crate twiggy-ir 0.7.0
[INFO] tweaked toml for crates.io crate twiggy-ir 0.7.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9bfa31f632912180dc742809bcc51a97f2d7079d" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 15 packages to latest compatible versions
[INFO] [stderr]       Adding cpp_demangle v0.3.5 (available: v0.4.4)
[INFO] [stderr]       Adding petgraph v0.6.5 (available: v0.8.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9bfa31f632912180dc742809bcc51a97f2d7079d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded frozen v1.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+9bfa31f632912180dc742809bcc51a97f2d7079d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7c4e5868ef1ebbf8af08264ed74a836964f63091c0347214f774a41f7f3b3911
[INFO] running `Command { std: "docker" "start" "-a" "7c4e5868ef1ebbf8af08264ed74a836964f63091c0347214f774a41f7f3b3911", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7c4e5868ef1ebbf8af08264ed74a836964f63091c0347214f774a41f7f3b3911", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c4e5868ef1ebbf8af08264ed74a836964f63091c0347214f774a41f7f3b3911", kill_on_drop: false }`
[INFO] [stdout] 7c4e5868ef1ebbf8af08264ed74a836964f63091c0347214f774a41f7f3b3911
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+9bfa31f632912180dc742809bcc51a97f2d7079d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e44440339657d5df43b9e73bba9c458d01331c5e7a41134113d3c4470f7a107f
[INFO] running `Command { std: "docker" "start" "-a" "e44440339657d5df43b9e73bba9c458d01331c5e7a41134113d3c4470f7a107f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]    Compiling unicode-ident v1.0.18
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]     Checking equivalent v1.0.2
[INFO] [stderr]    Compiling cpp_demangle v0.3.5
[INFO] [stderr]     Checking hashbrown v0.15.2
[INFO] [stderr]     Checking fixedbitset v0.4.2
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking frozen v1.0.0
[INFO] [stderr]     Checking rustc-demangle v0.1.24
[INFO] [stderr]     Checking indexmap v2.9.0
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]     Checking petgraph v0.6.5
[INFO] [stderr]    Compiling syn v2.0.100
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]     Checking twiggy-ir v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `roots` is never read
[INFO] [stdout]    --> ir.rs:149:5
[INFO] [stdout]     |
[INFO] [stdout] 141 | pub struct Items {
[INFO] [stdout]     |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 149 |     roots: Frozen<BTreeSet<Id>>,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Items` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `roots` is never read
[INFO] [stdout]    --> ir.rs:149:5
[INFO] [stdout]     |
[INFO] [stdout] 141 | pub struct Items {
[INFO] [stdout]     |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 149 |     roots: Frozen<BTreeSet<Id>>,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Items` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.57s
[INFO] running `Command { std: "docker" "inspect" "e44440339657d5df43b9e73bba9c458d01331c5e7a41134113d3c4470f7a107f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e44440339657d5df43b9e73bba9c458d01331c5e7a41134113d3c4470f7a107f", kill_on_drop: false }`
[INFO] [stdout] e44440339657d5df43b9e73bba9c458d01331c5e7a41134113d3c4470f7a107f