[INFO] crate gob 0.1.0 is already in cache
[INFO] checking gob-0.1.0 against master#b61e69433951e31f7bd746e22f516a48ad41623b for prs-64470-and-65389
[INFO] extracting crate gob 0.1.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate gob 0.1.0 on toolchain b61e69433951e31f7bd746e22f516a48ad41623b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate gob 0.1.0
[INFO] finished tweaking crates.io crate gob 0.1.0
[INFO] tweaked toml for crates.io crate gob 0.1.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 63eb1939cd14a054a0be86f371eacd056f054584ce96c21021ecda8204e320ad
[INFO] running `"docker" "start" "-a" "63eb1939cd14a054a0be86f371eacd056f054584ce96c21021ecda8204e320ad"`
[INFO] [stderr]    Compiling syn v0.13.11
[INFO] [stderr]     Checking serde_schema v0.0.1
[INFO] [stderr]     Checking serde_bytes v0.10.5
[INFO] [stderr]     Checking partial-io v0.3.1
[INFO] [stderr]    Compiling serde_derive_internals v0.23.1
[INFO] [stderr]    Compiling serde_schema_derive v0.0.1
[INFO] [stderr]     Checking gob v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: variable does not need to be mutable
[INFO] [stderr]    --> src/internal/ser/serialize_wire_types.rs:110:29
[INFO] [stderr]     |
[INFO] [stderr] 110 |                         let mut ser = FieldValueSerializer {
[INFO] [stderr]     |                             ----^^^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]    --> src/lib.rs:1:9
[INFO] [stderr]     |
[INFO] [stderr] 1   | #![deny(warnings)]
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr]     = note: `#[deny(unused_mut)]` implied by `#[deny(warnings)]`
[INFO] [stderr] 
[INFO] [stderr] error: variable does not need to be mutable
[INFO] [stderr]    --> src/internal/ser/serialize_wire_types.rs:110:29
[INFO] [stderr]     |
[INFO] [stderr] 110 |                         let mut ser = FieldValueSerializer {
[INFO] [stderr]     |                             ----^^^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]    --> src/lib.rs:1:9
[INFO] [stderr]     |
[INFO] [stderr] 1   | #![deny(warnings)]
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr]     = note: `#[deny(unused_mut)]` implied by `#[deny(warnings)]`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `gob`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `gob`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "63eb1939cd14a054a0be86f371eacd056f054584ce96c21021ecda8204e320ad"`
[INFO] running `"docker" "rm" "-f" "63eb1939cd14a054a0be86f371eacd056f054584ce96c21021ecda8204e320ad"`
[INFO] [stdout] 63eb1939cd14a054a0be86f371eacd056f054584ce96c21021ecda8204e320ad