[INFO] cloning repository https://github.com/MATATAT/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MATATAT/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMATATAT%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMATATAT%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2d0e50c57a30ae01e9994dac96c00b2f1c06f9f5
[INFO] testing MATATAT/rust-playground against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMATATAT%2Frust-playground" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MATATAT/rust-playground on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MATATAT/rust-playground
[INFO] finished tweaking git repo https://github.com/MATATAT/rust-playground
[INFO] tweaked toml for git repo https://github.com/MATATAT/rust-playground written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/MATATAT/rust-playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c72d2f4164b3d8d12eac570e20d625c93c21e353892931d5a529fc31f08e11f9
[INFO] running `Command { std: "docker" "start" "-a" "c72d2f4164b3d8d12eac570e20d625c93c21e353892931d5a529fc31f08e11f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c72d2f4164b3d8d12eac570e20d625c93c21e353892931d5a529fc31f08e11f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c72d2f4164b3d8d12eac570e20d625c93c21e353892931d5a529fc31f08e11f9", kill_on_drop: false }`
[INFO] [stdout] c72d2f4164b3d8d12eac570e20d625c93c21e353892931d5a529fc31f08e11f9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 65d112834fcb7f55bbe6cdddd345d88ce7e2a17b11ca942dd56cbf08ead403e6
[INFO] running `Command { std: "docker" "start" "-a" "65d112834fcb7f55bbe6cdddd345d88ce7e2a17b11ca942dd56cbf08ead403e6", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct is never constructed: `Foo`
[INFO] [stdout]  --> src/experiments/result_mapping.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Foo {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/experiments/result_mapping.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn new(value: Option<Bar>) -> Self {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_bar`
[INFO] [stdout]   --> src/experiments/result_mapping.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn to_bar(&self) -> Result<&Bar, &'static str> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Bar`
[INFO] [stdout]   --> src/experiments/result_mapping.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct Bar {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/experiments/result_mapping.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn new(value: String) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_value`
[INFO] [stdout]   --> src/experiments/result_mapping.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn to_value(&self) -> Result<String, &'static str> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.92s
[INFO] running `Command { std: "docker" "inspect" "65d112834fcb7f55bbe6cdddd345d88ce7e2a17b11ca942dd56cbf08ead403e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65d112834fcb7f55bbe6cdddd345d88ce7e2a17b11ca942dd56cbf08ead403e6", kill_on_drop: false }`
[INFO] [stdout] 65d112834fcb7f55bbe6cdddd345d88ce7e2a17b11ca942dd56cbf08ead403e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 71e3e99ac71dabf3cf9d8746c1ea758db07bf155c33f3bfa2a409ebe7eeb0723
[INFO] running `Command { std: "docker" "start" "-a" "71e3e99ac71dabf3cf9d8746c1ea758db07bf155c33f3bfa2a409ebe7eeb0723", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.40s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_playground-fe4a29b3e5a0c762)
[INFO] running `Command { std: "docker" "inspect" "71e3e99ac71dabf3cf9d8746c1ea758db07bf155c33f3bfa2a409ebe7eeb0723", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71e3e99ac71dabf3cf9d8746c1ea758db07bf155c33f3bfa2a409ebe7eeb0723", kill_on_drop: false }`
[INFO] [stdout] 71e3e99ac71dabf3cf9d8746c1ea758db07bf155c33f3bfa2a409ebe7eeb0723
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3cefc1e21cbc72684ff5b7ac6fb9cb8297bb11eed07638c77d76a15c16420fee
[INFO] running `Command { std: "docker" "start" "-a" "3cefc1e21cbc72684ff5b7ac6fb9cb8297bb11eed07638c77d76a15c16420fee", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_playground-fe4a29b3e5a0c762)
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test experiments::result_mapping::tests::all_good ... ok
[INFO] [stdout] test experiments::result_mapping::tests::bar_wrong_value ... ok
[INFO] [stdout] test experiments::result_mapping::tests::foo_no_value ... ok
[INFO] [stdout] test experiments::result_mapping::tests::vec_from_iter_keeps_err ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "3cefc1e21cbc72684ff5b7ac6fb9cb8297bb11eed07638c77d76a15c16420fee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3cefc1e21cbc72684ff5b7ac6fb9cb8297bb11eed07638c77d76a15c16420fee", kill_on_drop: false }`
[INFO] [stdout] 3cefc1e21cbc72684ff5b7ac6fb9cb8297bb11eed07638c77d76a15c16420fee