[INFO] fetching crate contiguous-mem 0.4.2...
[INFO] checking contiguous-mem-0.4.2 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate contiguous-mem 0.4.2 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate contiguous-mem 0.4.2 on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate contiguous-mem 0.4.2
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate contiguous-mem 0.4.2
[INFO] tweaked toml for crates.io crate contiguous-mem 0.4.2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate crates.io crate contiguous-mem 0.4.2 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" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 67ad5613f0d893b7a1f8471e6da19b5b83c9c52944230c7b2ddc21b5988e2e26
[INFO] running `Command { std: "docker" "start" "-a" "67ad5613f0d893b7a1f8471e6da19b5b83c9c52944230c7b2ddc21b5988e2e26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "67ad5613f0d893b7a1f8471e6da19b5b83c9c52944230c7b2ddc21b5988e2e26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "67ad5613f0d893b7a1f8471e6da19b5b83c9c52944230c7b2ddc21b5988e2e26", kill_on_drop: false }`
[INFO] [stdout] 67ad5613f0d893b7a1f8471e6da19b5b83c9c52944230c7b2ddc21b5988e2e26
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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 -Dtail_expr_drop_order" "-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f58a4289492c18952b2720957a95b4b96f54412e2c6c07d4dbbce8bc69da3cc
[INFO] running `Command { std: "docker" "start" "-a" "4f58a4289492c18952b2720957a95b4b96f54412e2c6c07d4dbbce8bc69da3cc", kill_on_drop: false }`
[INFO] [stderr]     Checking contiguous-mem v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `try_lock_named` is never used
[INFO] [stdout]   --> src/types.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub(crate) trait MutexTypesafe<T: ?Sized> {
[INFO] [stdout]    |                  ------------- method in this trait
[INFO] [stdout] 42 |     fn lock_named(&self, source: LockSource) -> Result<MutexGuard<T>, crate::error::LockingError>;
[INFO] [stdout] 43 |     fn try_lock_named(
[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: method `try_lock_named` is never used
[INFO] [stdout]   --> src/types.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub(crate) trait MutexTypesafe<T: ?Sized> {
[INFO] [stdout]    |                  ------------- method in this trait
[INFO] [stdout] 42 |     fn lock_named(&self, source: LockSource) -> Result<MutexGuard<T>, crate::error::LockingError>;
[INFO] [stdout] 43 |     fn try_lock_named(
[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` profile [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `Command { std: "docker" "inspect" "4f58a4289492c18952b2720957a95b4b96f54412e2c6c07d4dbbce8bc69da3cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f58a4289492c18952b2720957a95b4b96f54412e2c6c07d4dbbce8bc69da3cc", kill_on_drop: false }`
[INFO] [stdout] 4f58a4289492c18952b2720957a95b4b96f54412e2c6c07d4dbbce8bc69da3cc