[INFO] fetching crate nydus-app 0.3.2...
[INFO] checking nydus-app-0.3.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate nydus-app 0.3.2 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate nydus-app 0.3.2 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nydus-app 0.3.2
[INFO] finished tweaking crates.io crate nydus-app 0.3.2
[INFO] tweaked toml for crates.io crate nydus-app 0.3.2 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 54 packages
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding flexi_logger v0.23.3 (latest: v0.28.0)
[INFO] [stderr]       Adding hermit-abi v0.1.19 (latest: v0.3.9)
[INFO] [stderr]       Adding memoffset v0.6.5 (latest: v0.9.1)
[INFO] [stderr]       Adding nix v0.24.3 (latest: v0.28.0)
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "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 nydus-error v0.2.3
[INFO] [stderr]   Downloaded flexi_logger v0.23.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 43088147dfd1b00e368770d636b744564db9dea625f9a9f9175a71dd8396cb35
[INFO] running `Command { std: "docker" "start" "-a" "43088147dfd1b00e368770d636b744564db9dea625f9a9f9175a71dd8396cb35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43088147dfd1b00e368770d636b744564db9dea625f9a9f9175a71dd8396cb35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43088147dfd1b00e368770d636b744564db9dea625f9a9f9175a71dd8396cb35", kill_on_drop: false }`
[INFO] [stdout] 43088147dfd1b00e368770d636b744564db9dea625f9a9f9175a71dd8396cb35
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c32c1c5636cadc4bc238d87feb117d15620e06353917017fc01a8fa3e3128688
[INFO] running `Command { std: "docker" "start" "-a" "c32c1c5636cadc4bc238d87feb117d15620e06353917017fc01a8fa3e3128688", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking backtrace v0.3.71
[INFO] [stderr]    Compiling time v0.3.34
[INFO] [stderr]     Checking num_threads v0.1.7
[INFO] [stderr]     Checking nix v0.24.3
[INFO] [stderr]     Checking log-panics v2.1.0
[INFO] [stderr]    Compiling nydus-app v0.3.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking flexi_logger v0.23.3
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Checking nydus-error v0.2.3
[INFO] [stdout] warning: the item `flexi_logger` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     self, style, Cleanup, Criterion, DeferredNow, FileSpec, Logger, Naming,
[INFO] [stdout]    |     ^^^^ the item `flexi_logger` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `flexi_logger` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     self, style, Cleanup, Criterion, DeferredNow, FileSpec, Logger, Naming,
[INFO] [stdout]    |     ^^^^ the item `flexi_logger` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.70s
[INFO] running `Command { std: "docker" "inspect" "c32c1c5636cadc4bc238d87feb117d15620e06353917017fc01a8fa3e3128688", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c32c1c5636cadc4bc238d87feb117d15620e06353917017fc01a8fa3e3128688", kill_on_drop: false }`
[INFO] [stdout] c32c1c5636cadc4bc238d87feb117d15620e06353917017fc01a8fa3e3128688
[INFO] checking nydus-app-0.3.2 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate nydus-app 0.3.2 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate nydus-app 0.3.2 on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nydus-app 0.3.2
[INFO] finished tweaking crates.io crate nydus-app 0.3.2
[INFO] tweaked toml for crates.io crate nydus-app 0.3.2 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 54 packages
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding flexi_logger v0.23.3 (latest: v0.28.0)
[INFO] [stderr]       Adding hermit-abi v0.1.19 (latest: v0.3.9)
[INFO] [stderr]       Adding memoffset v0.6.5 (latest: v0.9.1)
[INFO] [stderr]       Adding nix v0.24.3 (latest: v0.28.0)
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 58f7bbe746c16dacdbd24601f605b8d59c07fbc4b93945d27ed860f6812f0359
[INFO] running `Command { std: "docker" "start" "-a" "58f7bbe746c16dacdbd24601f605b8d59c07fbc4b93945d27ed860f6812f0359", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "58f7bbe746c16dacdbd24601f605b8d59c07fbc4b93945d27ed860f6812f0359", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58f7bbe746c16dacdbd24601f605b8d59c07fbc4b93945d27ed860f6812f0359", kill_on_drop: false }`
[INFO] [stdout] 58f7bbe746c16dacdbd24601f605b8d59c07fbc4b93945d27ed860f6812f0359
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 75f1b93a1a65fd0d3aa523f07bc1db6e44ee05de25f2c311de8b5052deefb479
[INFO] running `Command { std: "docker" "start" "-a" "75f1b93a1a65fd0d3aa523f07bc1db6e44ee05de25f2c311de8b5052deefb479", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling time v0.3.34
[INFO] [stderr]     Checking backtrace v0.3.71
[INFO] [stderr]     Checking num_threads v0.1.7
[INFO] [stderr]     Checking log-panics v2.1.0
[INFO] [stderr]     Checking nix v0.24.3
[INFO] [stderr]     Checking flexi_logger v0.23.3
[INFO] [stderr]    Compiling nydus-app v0.3.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Checking nydus-error v0.2.3
[INFO] [stdout] warning: the item `flexi_logger` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     self, style, Cleanup, Criterion, DeferredNow, FileSpec, Logger, Naming,
[INFO] [stdout]    |     ^^^^ the item `flexi_logger` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `flexi_logger` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     self, style, Cleanup, Criterion, DeferredNow, FileSpec, Logger, Naming,
[INFO] [stdout]    |     ^^^^ the item `flexi_logger` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.04s
[INFO] running `Command { std: "docker" "inspect" "75f1b93a1a65fd0d3aa523f07bc1db6e44ee05de25f2c311de8b5052deefb479", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75f1b93a1a65fd0d3aa523f07bc1db6e44ee05de25f2c311de8b5052deefb479", kill_on_drop: false }`
[INFO] [stdout] 75f1b93a1a65fd0d3aa523f07bc1db6e44ee05de25f2c311de8b5052deefb479