[INFO] fetching crate mapo 0.1.0...
[INFO] testing mapo-0.1.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate mapo 0.1.0 into /workspace/builds/worker-78/source
[INFO] validating manifest of crates.io crate mapo 0.1.0 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mapo 0.1.0
[INFO] finished tweaking crates.io crate mapo 0.1.0
[INFO] tweaked toml for crates.io crate mapo 0.1.0 written to /workspace/builds/worker-78/source/Cargo.toml
[INFO] crate crates.io crate mapo 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded csv v1.1.4
[INFO] [stderr]   Downloaded to_precision v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ef038b5be3644942650fda46c3af70030a80837d928c911f52f2c4cadd874ab7
[INFO] running `Command { std: "docker" "start" "-a" "ef038b5be3644942650fda46c3af70030a80837d928c911f52f2c4cadd874ab7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ef038b5be3644942650fda46c3af70030a80837d928c911f52f2c4cadd874ab7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef038b5be3644942650fda46c3af70030a80837d928c911f52f2c4cadd874ab7", kill_on_drop: false }`
[INFO] [stdout] ef038b5be3644942650fda46c3af70030a80837d928c911f52f2c4cadd874ab7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e5b403f32af9335b35e4e83468ea72721d256634560f271d22c4e49b4f1c167
[INFO] running `Command { std: "docker" "start" "-a" "1e5b403f32af9335b35e4e83468ea72721d256634560f271d22c4e49b4f1c167", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling to_precision v0.1.1
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling mapo 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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(generic_associated_types)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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] [stderr] error: could not compile `mapo` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "1e5b403f32af9335b35e4e83468ea72721d256634560f271d22c4e49b4f1c167", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e5b403f32af9335b35e4e83468ea72721d256634560f271d22c4e49b4f1c167", kill_on_drop: false }`
[INFO] [stdout] 1e5b403f32af9335b35e4e83468ea72721d256634560f271d22c4e49b4f1c167