[INFO] fetching crate arc_ast 0.4.0...
[INFO] checking arc_ast-0.4.0 against master#f82664191d0e8764b7435b9d72eb0e366b8b1464 for pr-83354
[INFO] extracting crate arc_ast 0.4.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate arc_ast 0.4.0 on toolchain f82664191d0e8764b7435b9d72eb0e366b8b1464
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate arc_ast 0.4.0
[INFO] finished tweaking crates.io crate arc_ast 0.4.0
[INFO] tweaked toml for crates.io crate arc_ast 0.4.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd37e9c48f377e01b327f2c9c77a96c0ea8b70f3b87c919b4f7a7035d74efa02
[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" "bd37e9c48f377e01b327f2c9c77a96c0ea8b70f3b87c919b4f7a7035d74efa02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd37e9c48f377e01b327f2c9c77a96c0ea8b70f3b87c919b4f7a7035d74efa02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd37e9c48f377e01b327f2c9c77a96c0ea8b70f3b87c919b4f7a7035d74efa02", kill_on_drop: false }`
[INFO] [stdout] bd37e9c48f377e01b327f2c9c77a96c0ea8b70f3b87c919b4f7a7035d74efa02
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9c08350eb1698c9e506d46c71e40144fd436ce6be68ca144a9caab2ec141cf24
[INFO] running `Command { std: "docker" "start" "-a" "9c08350eb1698c9e506d46c71e40144fd436ce6be68ca144a9caab2ec141cf24", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]    Compiling num-bigint v0.3.2
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]     Checking num-complex v0.3.1
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking bigdecimal v0.2.0
[INFO] [stderr]     Checking num v0.3.1
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking arc_ast v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `move_ref_pattern` has been stable since 1.49.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(move_ref_pattern)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `move_ref_pattern` has been stable since 1.49.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(move_ref_pattern)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` 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 15.08s
[INFO] running `Command { std: "docker" "inspect" "9c08350eb1698c9e506d46c71e40144fd436ce6be68ca144a9caab2ec141cf24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c08350eb1698c9e506d46c71e40144fd436ce6be68ca144a9caab2ec141cf24", kill_on_drop: false }`
[INFO] [stdout] 9c08350eb1698c9e506d46c71e40144fd436ce6be68ca144a9caab2ec141cf24