[INFO] fetching crate rust_io 0.6.0...
[INFO] checking rust_io-0.6.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate rust_io 0.6.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate rust_io 0.6.0 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 rust_io 0.6.0
[INFO] finished tweaking crates.io crate rust_io 0.6.0
[INFO] tweaked toml for crates.io crate rust_io 0.6.0 written to /workspace/builds/worker-4-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]      Locking 103 packages
[INFO] [stderr]       Adding async-channel v1.9.0 (latest: v2.2.0)
[INFO] [stderr]       Adding async-io v1.13.0 (latest: v2.3.2)
[INFO] [stderr]       Adding async-lock v2.8.0 (latest: v3.3.0)
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding event-listener v2.5.3 (latest: v5.3.0)
[INFO] [stderr]       Adding event-listener v4.0.3 (latest: v5.3.0)
[INFO] [stderr]       Adding event-listener-strategy v0.4.0 (latest: v0.5.1)
[INFO] [stderr]       Adding fastrand v1.9.0 (latest: v2.0.2)
[INFO] [stderr]       Adding futures-lite v1.13.0 (latest: v2.3.0)
[INFO] [stderr]       Adding gloo-timers v0.2.6 (latest: v0.3.0)
[INFO] [stderr]       Adding io-lifetimes v1.0.11 (latest: v2.0.3)
[INFO] [stderr]       Adding linux-raw-sys v0.3.8 (latest: v0.6.4)
[INFO] [stderr]       Adding linux-raw-sys v0.4.13 (latest: v0.6.4)
[INFO] [stderr]       Adding polling v2.8.0 (latest: v3.6.0)
[INFO] [stderr]       Adding rustix v0.37.27 (latest: v0.38.32)
[INFO] [stderr]       Adding socket2 v0.4.10 (latest: v0.5.6)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[INFO] [stderr]       Adding windows-sys v0.48.0 (latest: v0.52.0)
[INFO] [stderr]       Adding windows-targets v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_msvc v0.48.5 (latest: v0.52.4)
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 64838391291cfbb0ada4745f57f10b14b61202a3802ec1e10c657b7c5cbf8300
[INFO] running `Command { std: "docker" "start" "-a" "64838391291cfbb0ada4745f57f10b14b61202a3802ec1e10c657b7c5cbf8300", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "64838391291cfbb0ada4745f57f10b14b61202a3802ec1e10c657b7c5cbf8300", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64838391291cfbb0ada4745f57f10b14b61202a3802ec1e10c657b7c5cbf8300", kill_on_drop: false }`
[INFO] [stdout] 64838391291cfbb0ada4745f57f10b14b61202a3802ec1e10c657b7c5cbf8300
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 678f891a20d90a20e9176e2dd90ef92b7b1349cafc4758d652930da2842fcca4
[INFO] running `Command { std: "docker" "start" "-a" "678f891a20d90a20e9176e2dd90ef92b7b1349cafc4758d652930da2842fcca4", kill_on_drop: false }`
[INFO] [stderr]     Checking pin-project-lite v0.2.14
[INFO] [stderr]    Compiling autocfg v1.2.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]     Checking parking v2.2.0
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking futures-io v0.3.30
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.79
[INFO] [stderr]     Checking fastrand v2.0.2
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]     Checking memchr v2.7.2
[INFO] [stderr]    Compiling rustix v0.38.32
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]     Checking value-bag v1.8.1
[INFO] [stderr]    Compiling io-lifetimes v1.0.11
[INFO] [stderr]     Checking linux-raw-sys v0.4.13
[INFO] [stderr]     Checking bitflags v2.5.0
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]    Compiling rustix v0.37.27
[INFO] [stderr]     Checking atomic-waker v1.1.2
[INFO] [stderr]     Checking async-task v4.7.0
[INFO] [stderr]     Checking futures-sink v0.3.30
[INFO] [stderr]     Checking futures-lite v2.3.0
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]     Checking fastrand v1.9.0
[INFO] [stderr]     Checking piper v0.2.1
[INFO] [stderr]     Checking log v0.4.21
[INFO] [stderr]     Checking futures-task v0.3.30
[INFO] [stderr]     Checking linux-raw-sys v0.3.8
[INFO] [stderr]     Checking waker-fn v1.1.1
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking async-lock v2.8.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling polling v2.8.0
[INFO] [stderr]    Compiling async-io v1.13.0
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]     Checking futures-lite v1.13.0
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking concurrent-queue v2.4.0
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]     Checking event-listener v4.0.3
[INFO] [stderr]     Checking event-listener v5.3.0
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]     Checking event-listener-strategy v0.4.0
[INFO] [stderr]     Checking event-listener-strategy v0.5.1
[INFO] [stderr]     Checking async-channel v2.2.0
[INFO] [stderr]     Checking async-lock v3.3.0
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking socket2 v0.4.10
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking async-executor v1.9.1
[INFO] [stderr]     Checking blocking v1.5.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking polling v3.6.0
[INFO] [stderr]     Checking async-io v2.3.2
[INFO] [stderr]     Checking async-global-executor v2.4.1
[INFO] [stderr]     Checking async-std v1.12.0
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking rust_io v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Rng`, `thread_rng`
[INFO] [stdout]  --> src/lib.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rand::{Rng, thread_rng};
[INFO] [stdout]   |            ^^^  ^^^^^^^^^^
[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: unused variable: `t`
[INFO] [stdout]    --> src/lib.rs:782:29
[INFO] [stdout]     |
[INFO] [stdout] 782 |                 .map_error(|t| String::from("Error B"));
[INFO] [stdout]     |                             ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/lib.rs:930:29
[INFO] [stdout]     |
[INFO] [stdout] 930 |                 .map_error(|t| String::from("Error B"))
[INFO] [stdout]     |                             ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 19.84s
[INFO] running `Command { std: "docker" "inspect" "678f891a20d90a20e9176e2dd90ef92b7b1349cafc4758d652930da2842fcca4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "678f891a20d90a20e9176e2dd90ef92b7b1349cafc4758d652930da2842fcca4", kill_on_drop: false }`
[INFO] [stdout] 678f891a20d90a20e9176e2dd90ef92b7b1349cafc4758d652930da2842fcca4
[INFO] checking rust_io-0.6.0 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate rust_io 0.6.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate rust_io 0.6.0 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 rust_io 0.6.0
[INFO] finished tweaking crates.io crate rust_io 0.6.0
[INFO] tweaked toml for crates.io crate rust_io 0.6.0 written to /workspace/builds/worker-4-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 103 packages
[INFO] [stderr]       Adding async-channel v1.9.0 (latest: v2.2.0)
[INFO] [stderr]       Adding async-io v1.13.0 (latest: v2.3.2)
[INFO] [stderr]       Adding async-lock v2.8.0 (latest: v3.3.0)
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding event-listener v2.5.3 (latest: v5.3.0)
[INFO] [stderr]       Adding event-listener v4.0.3 (latest: v5.3.0)
[INFO] [stderr]       Adding event-listener-strategy v0.4.0 (latest: v0.5.1)
[INFO] [stderr]       Adding fastrand v1.9.0 (latest: v2.0.2)
[INFO] [stderr]       Adding futures-lite v1.13.0 (latest: v2.3.0)
[INFO] [stderr]       Adding gloo-timers v0.2.6 (latest: v0.3.0)
[INFO] [stderr]       Adding io-lifetimes v1.0.11 (latest: v2.0.3)
[INFO] [stderr]       Adding linux-raw-sys v0.3.8 (latest: v0.6.4)
[INFO] [stderr]       Adding linux-raw-sys v0.4.13 (latest: v0.6.4)
[INFO] [stderr]       Adding polling v2.8.0 (latest: v3.6.0)
[INFO] [stderr]       Adding rustix v0.37.27 (latest: v0.38.32)
[INFO] [stderr]       Adding socket2 v0.4.10 (latest: v0.5.6)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[INFO] [stderr]       Adding windows-sys v0.48.0 (latest: v0.52.0)
[INFO] [stderr]       Adding windows-targets v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_msvc v0.48.5 (latest: v0.52.4)
[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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] a5a2fbac6096fa17ecfd3d6823f52160113cbfa52d47f2f0e297435f7cb68773
[INFO] running `Command { std: "docker" "start" "-a" "a5a2fbac6096fa17ecfd3d6823f52160113cbfa52d47f2f0e297435f7cb68773", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a5a2fbac6096fa17ecfd3d6823f52160113cbfa52d47f2f0e297435f7cb68773", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a5a2fbac6096fa17ecfd3d6823f52160113cbfa52d47f2f0e297435f7cb68773", kill_on_drop: false }`
[INFO] [stdout] a5a2fbac6096fa17ecfd3d6823f52160113cbfa52d47f2f0e297435f7cb68773
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 90dd3625297a8b043c7031b7733b521401475410d54a127dc68556fd812f2d44
[INFO] running `Command { std: "docker" "start" "-a" "90dd3625297a8b043c7031b7733b521401475410d54a127dc68556fd812f2d44", kill_on_drop: false }`
[INFO] [stderr]     Checking pin-project-lite v0.2.14
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]    Compiling autocfg v1.2.0
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]     Checking parking v2.2.0
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking futures-io v0.3.30
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.79
[INFO] [stderr]     Checking fastrand v2.0.2
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]     Checking memchr v2.7.2
[INFO] [stderr]    Compiling rustix v0.38.32
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]     Checking value-bag v1.8.1
[INFO] [stderr]     Checking linux-raw-sys v0.4.13
[INFO] [stderr]    Compiling io-lifetimes v1.0.11
[INFO] [stderr]     Checking bitflags v2.5.0
[INFO] [stderr]     Checking futures-sink v0.3.30
[INFO] [stderr]     Checking async-task v4.7.0
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]    Compiling rustix v0.37.27
[INFO] [stderr]     Checking atomic-waker v1.1.2
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]     Checking futures-lite v2.3.0
[INFO] [stderr]     Checking piper v0.2.1
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking futures-task v0.3.30
[INFO] [stderr]     Checking linux-raw-sys v0.3.8
[INFO] [stderr]     Checking waker-fn v1.1.1
[INFO] [stderr]     Checking log v0.4.21
[INFO] [stderr]     Checking fastrand v1.9.0
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling polling v2.8.0
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]    Compiling async-io v1.13.0
[INFO] [stderr]     Checking async-lock v2.8.0
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking concurrent-queue v2.4.0
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking event-listener v4.0.3
[INFO] [stderr]     Checking event-listener v5.3.0
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]     Checking futures-lite v1.13.0
[INFO] [stderr]     Checking event-listener-strategy v0.5.1
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]     Checking async-channel v2.2.0
[INFO] [stderr]     Checking event-listener-strategy v0.4.0
[INFO] [stderr]     Checking async-lock v3.3.0
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking socket2 v0.4.10
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking async-executor v1.9.1
[INFO] [stderr]     Checking blocking v1.5.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]     Checking polling v3.6.0
[INFO] [stderr]     Checking async-io v2.3.2
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking async-global-executor v2.4.1
[INFO] [stderr]     Checking async-std v1.12.0
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking rust_io v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Rng`, `thread_rng`
[INFO] [stdout]  --> src/lib.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rand::{Rng, thread_rng};
[INFO] [stdout]   |            ^^^  ^^^^^^^^^^
[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: unused variable: `t`
[INFO] [stdout]    --> src/lib.rs:782:29
[INFO] [stdout]     |
[INFO] [stdout] 782 |                 .map_error(|t| String::from("Error B"));
[INFO] [stdout]     |                             ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/lib.rs:930:29
[INFO] [stdout]     |
[INFO] [stdout] 930 |                 .map_error(|t| String::from("Error B"))
[INFO] [stdout]     |                             ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.05s
[INFO] running `Command { std: "docker" "inspect" "90dd3625297a8b043c7031b7733b521401475410d54a127dc68556fd812f2d44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90dd3625297a8b043c7031b7733b521401475410d54a127dc68556fd812f2d44", kill_on_drop: false }`
[INFO] [stdout] 90dd3625297a8b043c7031b7733b521401475410d54a127dc68556fd812f2d44