[INFO] cloning repository https://github.com/ZainlessBrombie/rs-safe-gc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ZainlessBrombie/rs-safe-gc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FZainlessBrombie%2Frs-safe-gc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FZainlessBrombie%2Frs-safe-gc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e20adb3c5d8d1d3e0a8f23d52cae7411971293ac
[INFO] checking ZainlessBrombie/rs-safe-gc against try#15a786332e2f0dd343b226ab6bb8ec028a350f73 for pr-81782
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FZainlessBrombie%2Frs-safe-gc" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ZainlessBrombie/rs-safe-gc on toolchain 15a786332e2f0dd343b226ab6bb8ec028a350f73
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ZainlessBrombie/rs-safe-gc
[INFO] finished tweaking git repo https://github.com/ZainlessBrombie/rs-safe-gc
[INFO] tweaked toml for git repo https://github.com/ZainlessBrombie/rs-safe-gc written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/ZainlessBrombie/rs-safe-gc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a55667e0821b5519dd0b711dc21bc33e7ae24a5ead65b3ae9838a196d7c30d06
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a55667e0821b5519dd0b711dc21bc33e7ae24a5ead65b3ae9838a196d7c30d06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a55667e0821b5519dd0b711dc21bc33e7ae24a5ead65b3ae9838a196d7c30d06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a55667e0821b5519dd0b711dc21bc33e7ae24a5ead65b3ae9838a196d7c30d06", kill_on_drop: false }`
[INFO] [stdout] a55667e0821b5519dd0b711dc21bc33e7ae24a5ead65b3ae9838a196d7c30d06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c00aa337543ea707775c20771538ae907c9118f8d28f6d51cc1a0d3395573b9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4c00aa337543ea707775c20771538ae907c9118f8d28f6d51cc1a0d3395573b9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.53
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling safe_gc_derive v0.0.0 (/opt/rustwide/workdir/gc-macro)
[INFO] [stderr]     Checking safe-gc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `into_inner`
[INFO] [stdout]    --> src/gc.rs:251:12
[INFO] [stdout]     |
[INFO] [stdout] 251 |     pub fn into_inner(self) -> T {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `into_inner`
[INFO] [stdout]    --> src/gc.rs:251:12
[INFO] [stdout]     |
[INFO] [stdout] 251 |     pub fn into_inner(self) -> T {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.51s
[INFO] running `Command { std: "docker" "inspect" "4c00aa337543ea707775c20771538ae907c9118f8d28f6d51cc1a0d3395573b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c00aa337543ea707775c20771538ae907c9118f8d28f6d51cc1a0d3395573b9", kill_on_drop: false }`
[INFO] [stdout] 4c00aa337543ea707775c20771538ae907c9118f8d28f6d51cc1a0d3395573b9