[INFO] fetching crate mcaptcha_pow_sha256 0.5.0...
[INFO] testing mcaptcha_pow_sha256-0.5.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate mcaptcha_pow_sha256 0.5.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate mcaptcha_pow_sha256 0.5.0
[INFO] finished tweaking crates.io crate mcaptcha_pow_sha256 0.5.0
[INFO] tweaked toml for crates.io crate mcaptcha_pow_sha256 0.5.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mcaptcha_pow_sha256 0.5.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mcaptcha_pow_sha256 0.5.0 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_derive v1.0.189
[INFO] [stderr]   Downloaded serde v1.0.189
[INFO] [stderr]   Downloaded libc v0.2.149
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 37fcdbe0a8c9a8246fa2acb6e52a1af0a9a5993f9ebd0c6e20d8874c2da7f6f9
[INFO] running `Command { std: "docker" "start" "-a" "37fcdbe0a8c9a8246fa2acb6e52a1af0a9a5993f9ebd0c6e20d8874c2da7f6f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "37fcdbe0a8c9a8246fa2acb6e52a1af0a9a5993f9ebd0c6e20d8874c2da7f6f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37fcdbe0a8c9a8246fa2acb6e52a1af0a9a5993f9ebd0c6e20d8874c2da7f6f9", kill_on_drop: false }`
[INFO] [stdout] 37fcdbe0a8c9a8246fa2acb6e52a1af0a9a5993f9ebd0c6e20d8874c2da7f6f9
[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=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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 829b6af810bdae1de81465e7ec170cf51838fdb4213682fc9a1d56d4d3642a27
[INFO] running `Command { std: "docker" "start" "-a" "829b6af810bdae1de81465e7ec170cf51838fdb4213682fc9a1d56d4d3642a27", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.69
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling serde v1.0.189
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling num-traits v0.2.17
[INFO] [stderr]    Compiling num-bigint v0.4.4
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.38
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling sha2 v0.10.8
[INFO] [stderr]    Compiling serde_derive v1.0.189
[INFO] [stderr]    Compiling darling_core v0.14.4
[INFO] [stderr]    Compiling darling_macro v0.14.4
[INFO] [stderr]    Compiling darling v0.14.4
[INFO] [stderr]    Compiling derive_builder_core v0.12.0
[INFO] [stderr]    Compiling derive_builder_macro v0.12.0
[INFO] [stderr]    Compiling derive_builder v0.12.0
[INFO] [stderr]    Compiling num-complex v0.4.4
[INFO] [stderr]    Compiling bincode v1.3.3
[INFO] [stderr]    Compiling num v0.4.1
[INFO] [stderr]    Compiling mcaptcha_pow_sha256 v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.66s
[INFO] running `Command { std: "docker" "inspect" "829b6af810bdae1de81465e7ec170cf51838fdb4213682fc9a1d56d4d3642a27", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "829b6af810bdae1de81465e7ec170cf51838fdb4213682fc9a1d56d4d3642a27", kill_on_drop: false }`
[INFO] [stdout] 829b6af810bdae1de81465e7ec170cf51838fdb4213682fc9a1d56d4d3642a27
[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=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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a4156282f342da7c4b5d2d5423ad36f5988145d461c0e6eb30f87d5033f957bb
[INFO] running `Command { std: "docker" "start" "-a" "a4156282f342da7c4b5d2d5423ad36f5988145d461c0e6eb30f87d5033f957bb", kill_on_drop: false }`
[INFO] [stderr]    Compiling mcaptcha_pow_sha256 v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `PoW`
[INFO] [stdout]   --> examples/simple.rs:10:42
[INFO] [stdout]    |
[INFO] [stdout] 10 | use mcaptcha_pow_sha256::{ConfigBuilder, PoW};
[INFO] [stdout]    |                                          ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.75s
[INFO] running `Command { std: "docker" "inspect" "a4156282f342da7c4b5d2d5423ad36f5988145d461c0e6eb30f87d5033f957bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4156282f342da7c4b5d2d5423ad36f5988145d461c0e6eb30f87d5033f957bb", kill_on_drop: false }`
[INFO] [stdout] a4156282f342da7c4b5d2d5423ad36f5988145d461c0e6eb30f87d5033f957bb
[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=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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 1292b12da03b37a92105338af76efab6ab2ae6cb710a23a54d1de64e400918ab
[INFO] running `Command { std: "docker" "start" "-a" "1292b12da03b37a92105338af76efab6ab2ae6cb710a23a54d1de64e400918ab", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `PoW`
[INFO] [stderr]   --> examples/simple.rs:10:42
[INFO] [stderr]    |
[INFO] [stderr] 10 | use mcaptcha_pow_sha256::{ConfigBuilder, PoW};
[INFO] [stderr]    |                                          ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `mcaptcha_pow_sha256` (example "simple") generated 1 warning (run `cargo fix --example "simple"` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/mcaptcha_pow_sha256-e31f1a4c00f855a6)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test test::base_functionality ... ok
[INFO] [stdout] test test::serialization_test ... ok
[INFO] [stdout] test test::is_not_valid_proof ... ok
[INFO] [stdout] test test::double_pow ... ok
[INFO] [stdout] test test::computation_time_test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 7.08s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mcaptcha_pow_sha256
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 9) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.27s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "1292b12da03b37a92105338af76efab6ab2ae6cb710a23a54d1de64e400918ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1292b12da03b37a92105338af76efab6ab2ae6cb710a23a54d1de64e400918ab", kill_on_drop: false }`
[INFO] [stdout] 1292b12da03b37a92105338af76efab6ab2ae6cb710a23a54d1de64e400918ab