[INFO] fetching crate gcmodule 0.3.3...
[INFO] checking gcmodule-0.3.3 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate gcmodule 0.3.3 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate gcmodule 0.3.3
[INFO] finished tweaking crates.io crate gcmodule 0.3.3
[INFO] tweaked toml for crates.io crate gcmodule 0.3.3 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate gcmodule 0.3.3 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 30 packages to latest compatible versions
[INFO] [stderr]       Adding parking_lot v0.10.2 (available: v0.12.4)
[INFO] [stderr]       Adding quickcheck v0.9.2 (available: v1.0.3)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded parking_lot_core v0.7.3
[INFO] [stderr]   Downloaded gcmodule_derive v0.3.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2bab5edb9a68bcd41657afc879ed36ea780fbe0a965c66e3d5a06e312048005a
[INFO] running `Command { std: "docker" "start" "-a" "2bab5edb9a68bcd41657afc879ed36ea780fbe0a965c66e3d5a06e312048005a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2bab5edb9a68bcd41657afc879ed36ea780fbe0a965c66e3d5a06e312048005a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2bab5edb9a68bcd41657afc879ed36ea780fbe0a965c66e3d5a06e312048005a", kill_on_drop: false }`
[INFO] [stdout] 2bab5edb9a68bcd41657afc879ed36ea780fbe0a965c66e3d5a06e312048005a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c0da9a465892aa993c5d2b60c891305ab570bbe641b759059139f0c88acb822e
[INFO] running `Command { std: "docker" "start" "-a" "c0da9a465892aa993c5d2b60c891305ab570bbe641b759059139f0c88acb822e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]    Compiling zerocopy v0.8.26
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]     Checking cfg-if v1.0.1
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking smallvec v1.15.1
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking parking_lot_core v0.7.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling gcmodule_derive v0.3.3
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking gcmodule v0.3.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: using `.deref()` on a double reference, which returns `*const GcHeader` instead of dereferencing the inner type
[INFO] [stdout]   --> src/collect.rs:93:29
[INFO] [stdout]    |
[INFO] [stdout] 93 |         header.prev.set(prev.deref());
[INFO] [stdout]    |                             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/collect.rs:391:5
[INFO] [stdout]     |
[INFO] [stdout] 391 |     drop(list);
[INFO] [stdout]     |     ^^^^^----^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          argument has type `&L`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 391 -     drop(list);
[INFO] [stdout] 391 +     let _ = list;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.deref()` on a double reference, which returns `*const Header` instead of dereferencing the inner type
[INFO] [stdout]   --> src/sync/collect.rs:62:29
[INFO] [stdout]    |
[INFO] [stdout] 62 |         header.prev.set(prev.deref());
[INFO] [stdout]    |                             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking quickcheck v0.9.2
[INFO] [stdout] warning: using `.deref()` on a double reference, which returns `*const GcHeader` instead of dereferencing the inner type
[INFO] [stdout]   --> src/collect.rs:93:29
[INFO] [stdout]    |
[INFO] [stdout] 93 |         header.prev.set(prev.deref());
[INFO] [stdout]    |                             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/collect.rs:391:5
[INFO] [stdout]     |
[INFO] [stdout] 391 |     drop(list);
[INFO] [stdout]     |     ^^^^^----^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          argument has type `&L`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 391 -     drop(list);
[INFO] [stdout] 391 +     let _ = list;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.deref()` on a double reference, which returns `*const Header` instead of dereferencing the inner type
[INFO] [stdout]   --> src/sync/collect.rs:62:29
[INFO] [stdout]    |
[INFO] [stdout] 62 |         header.prev.set(prev.deref());
[INFO] [stdout]    |                             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.59s
[INFO] running `Command { std: "docker" "inspect" "c0da9a465892aa993c5d2b60c891305ab570bbe641b759059139f0c88acb822e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0da9a465892aa993c5d2b60c891305ab570bbe641b759059139f0c88acb822e", kill_on_drop: false }`
[INFO] [stdout] c0da9a465892aa993c5d2b60c891305ab570bbe641b759059139f0c88acb822e