[INFO] cloning repository https://github.com/ottermata/iter-opt-filter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ottermata/iter-opt-filter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fottermata%2Fiter-opt-filter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fottermata%2Fiter-opt-filter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c112199cb47ace4b3a7f37edffd88f2f958fca57
[INFO] testing ottermata/iter-opt-filter against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fottermata%2Fiter-opt-filter" "/workspace/builds/worker-46/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-46/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ottermata/iter-opt-filter on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ottermata/iter-opt-filter
[INFO] finished tweaking git repo https://github.com/ottermata/iter-opt-filter
[INFO] tweaked toml for git repo https://github.com/ottermata/iter-opt-filter written to /workspace/builds/worker-46/source/Cargo.toml
[INFO] crate git repo https://github.com/ottermata/iter-opt-filter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.author
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a80e13d95346482300747f47ae38e5acc43f59a884615a57d3ee2cd76d180973
[INFO] running `Command { std: "docker" "start" "-a" "a80e13d95346482300747f47ae38e5acc43f59a884615a57d3ee2cd76d180973", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a80e13d95346482300747f47ae38e5acc43f59a884615a57d3ee2cd76d180973", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a80e13d95346482300747f47ae38e5acc43f59a884615a57d3ee2cd76d180973", kill_on_drop: false }`
[INFO] [stdout] a80e13d95346482300747f47ae38e5acc43f59a884615a57d3ee2cd76d180973
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eba4e24988cda810e1ec8a93fbc854e89d08b5c0ac3ca71c86b4f4bd62b3d98b
[INFO] running `Command { std: "docker" "start" "-a" "eba4e24988cda810e1ec8a93fbc854e89d08b5c0ac3ca71c86b4f4bd62b3d98b", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.author
[INFO] [stderr]    Compiling iter-opt-filter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.31s
[INFO] running `Command { std: "docker" "inspect" "eba4e24988cda810e1ec8a93fbc854e89d08b5c0ac3ca71c86b4f4bd62b3d98b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eba4e24988cda810e1ec8a93fbc854e89d08b5c0ac3ca71c86b4f4bd62b3d98b", kill_on_drop: false }`
[INFO] [stdout] eba4e24988cda810e1ec8a93fbc854e89d08b5c0ac3ca71c86b4f4bd62b3d98b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 81ddb5f9ef866290ac478521fe1786263181fb624535058b0dff69f0502872ea
[INFO] running `Command { std: "docker" "start" "-a" "81ddb5f9ef866290ac478521fe1786263181fb624535058b0dff69f0502872ea", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.author
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling iter-opt-filter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:11:19
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![cfg_attr(test, feature(test))]
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `iter-opt-filter` due to 2 previous errors
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "81ddb5f9ef866290ac478521fe1786263181fb624535058b0dff69f0502872ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81ddb5f9ef866290ac478521fe1786263181fb624535058b0dff69f0502872ea", kill_on_drop: false }`
[INFO] [stdout] 81ddb5f9ef866290ac478521fe1786263181fb624535058b0dff69f0502872ea