[INFO] fetching crate rust_io 0.6.0...
[INFO] testing rust_io-0.6.0 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate rust_io 0.6.0 into /workspace/builds/worker-1-tc2/source
[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-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rust_io 0.6.0 on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 69 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 13beda35d289ea0c24c4100772dfb8dbf62324d9588cf6e01158a0c724cc64c8
[INFO] running `Command { std: "docker" "start" "-a" "13beda35d289ea0c24c4100772dfb8dbf62324d9588cf6e01158a0c724cc64c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "13beda35d289ea0c24c4100772dfb8dbf62324d9588cf6e01158a0c724cc64c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "13beda35d289ea0c24c4100772dfb8dbf62324d9588cf6e01158a0c724cc64c8", kill_on_drop: false }`
[INFO] [stdout] 13beda35d289ea0c24c4100772dfb8dbf62324d9588cf6e01158a0c724cc64c8
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e17172a5663267f78cdd3c7e251361758f1a97f0afd880a2829b7031db543e58
[INFO] running `Command { std: "docker" "start" "-a" "e17172a5663267f78cdd3c7e251361758f1a97f0afd880a2829b7031db543e58", kill_on_drop: false }`
[INFO] [stderr]    Compiling event-listener v5.4.1
[INFO] [stderr]    Compiling syn v2.0.108
[INFO] [stderr]    Compiling event-listener-strategy v0.5.4
[INFO] [stderr]    Compiling async-channel v2.5.0
[INFO] [stderr]    Compiling async-lock v3.4.1
[INFO] [stderr]    Compiling blocking v1.6.2
[INFO] [stderr]    Compiling async-global-executor v2.4.1
[INFO] [stderr]    Compiling async-std v1.13.2
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling futures-executor v0.3.31
[INFO] [stderr]    Compiling futures v0.3.31
[INFO] [stderr]    Compiling rust_io v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Rng` and `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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.68s
[INFO] running `Command { std: "docker" "inspect" "e17172a5663267f78cdd3c7e251361758f1a97f0afd880a2829b7031db543e58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e17172a5663267f78cdd3c7e251361758f1a97f0afd880a2829b7031db543e58", kill_on_drop: false }`
[INFO] [stdout] e17172a5663267f78cdd3c7e251361758f1a97f0afd880a2829b7031db543e58
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 24b6fdda1327ae588b78fb1462b385e59617a04a86017b67c37dd4fb22cb4cb7
[INFO] running `Command { std: "docker" "start" "-a" "24b6fdda1327ae588b78fb1462b385e59617a04a86017b67c37dd4fb22cb4cb7", kill_on_drop: false }`
[INFO] [stdout] warning: unused imports: `Rng` and `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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rust_io v0.6.0 (/opt/rustwide/workdir)
[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)]` (part of `#[warn(unused)]`) 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] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.65s
[INFO] running `Command { std: "docker" "inspect" "24b6fdda1327ae588b78fb1462b385e59617a04a86017b67c37dd4fb22cb4cb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24b6fdda1327ae588b78fb1462b385e59617a04a86017b67c37dd4fb22cb4cb7", kill_on_drop: false }`
[INFO] [stdout] 24b6fdda1327ae588b78fb1462b385e59617a04a86017b67c37dd4fb22cb4cb7
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 28f46c475a17a1e6aae68d5e2064e48de1255b39e7266456636c37b6c64ddc09
[INFO] running `Command { std: "docker" "start" "-a" "28f46c475a17a1e6aae68d5e2064e48de1255b39e7266456636c37b6c64ddc09", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `Rng` and `thread_rng`
[INFO] [stderr]  --> src/lib.rs:7:12
[INFO] [stderr]   |
[INFO] [stderr] 7 | use rand::{Rng, thread_rng};
[INFO] [stderr]   |            ^^^  ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_io` (lib) generated 1 warning (run `cargo fix --lib -p rust_io` to apply 1 suggestion)
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]    --> src/lib.rs:782:29
[INFO] [stderr]     |
[INFO] [stderr] 782 |                 .map_error(|t| String::from("Error B"));
[INFO] [stderr]     |                             ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]    --> src/lib.rs:930:29
[INFO] [stderr]     |
[INFO] [stderr] 930 |                 .map_error(|t| String::from("Error B"))
[INFO] [stderr]     |                             ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_io` (lib test) generated 2 warnings (run `cargo fix --lib -p rust_io --tests` to apply 2 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rust_io-eda3e538ae0fbfec)
[INFO] [stdout] 
[INFO] [stdout] running 30 tests
[INFO] [stdout] test tests::rio ... ok
[INFO] [stdout] test tests::rio_compose_two_programs ... ok
[INFO] [stdout] test tests::rio_daemon ... ok
[INFO] [stdout] test tests::rio_empty_recover ... ok
[INFO] [stdout] test tests::rio_error_recover ... ok
[INFO] [stdout] test tests::rio_eventually ... ok
[INFO] [stdout] test tests::rio_error_recover_with ... ok
[INFO] [stdout] test tests::rio_filter ... ok
[INFO] [stdout] test tests::rio_error ... ok
[INFO] [stdout] test tests::rio_filter_empty ... ok
[INFO] [stdout] test tests::rio_flat_map ... ok
[INFO] [stdout] test tests::rio_fold ... ok
[INFO] [stdout] test tests::rio_fork ... ok
[INFO] [stdout] test tests::rio_get_or_else ... ok
[INFO] [stdout] test tests::rio_map ... ok
[INFO] [stdout] test tests::rio_merge ... ok
[INFO] [stdout] test tests::rio_merge_error ... ok
[INFO] [stdout] test tests::rio_map_error ... ok
[INFO] [stdout] test tests::rio_on_error ... ok
[INFO] [stdout] test tests::rio_on_success ... ok
[INFO] [stdout] test tests::rio_option_recover_with ... ok
[INFO] [stdout] test tests::rio_when ... ok
[INFO] [stdout] test tests::rio_parallel ... ok
[INFO] [stdout] test tests::rio_zip ... ok
[INFO] [stdout] test tests::rio_peek ... ok
[INFO] [stdout] test tests::rio_eventually_while ... ok
[INFO] [stdout] test tests::rio_when_rio ... ok
[INFO] [stdout] test tests::rio_eventually_until ... ok
[INFO] [stdout] test tests::features ... ok
[INFO] [stdout] test tests::rio_delay ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 30 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests rust_io
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "28f46c475a17a1e6aae68d5e2064e48de1255b39e7266456636c37b6c64ddc09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28f46c475a17a1e6aae68d5e2064e48de1255b39e7266456636c37b6c64ddc09", kill_on_drop: false }`
[INFO] [stdout] 28f46c475a17a1e6aae68d5e2064e48de1255b39e7266456636c37b6c64ddc09