[INFO] fetching crate mock_me 0.2.3...
[INFO] testing mock_me-0.2.3 against 1.60.0 for beta-1.61-1
[INFO] extracting crate mock_me 0.2.3 into /workspace/builds/worker-81/source
[INFO] validating manifest of crates.io crate mock_me 0.2.3 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mock_me 0.2.3
[INFO] finished tweaking crates.io crate mock_me 0.2.3
[INFO] tweaked toml for crates.io crate mock_me 0.2.3 written to /workspace/builds/worker-81/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: library `mock_me` should only specify `proc-macro = true` instead of setting `crate-type`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mock_me_test_context v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fea1646bcea98ca293d81854f6a303db94edabf3d9211d0c051a3de14b031c7f
[INFO] running `Command { std: "docker" "start" "-a" "fea1646bcea98ca293d81854f6a303db94edabf3d9211d0c051a3de14b031c7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fea1646bcea98ca293d81854f6a303db94edabf3d9211d0c051a3de14b031c7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fea1646bcea98ca293d81854f6a303db94edabf3d9211d0c051a3de14b031c7f", kill_on_drop: false }`
[INFO] [stdout] fea1646bcea98ca293d81854f6a303db94edabf3d9211d0c051a3de14b031c7f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4260c96643f4a65555cd2b33d5c07afc27e9f1c168a24f2af820fe59811100c6
[INFO] running `Command { std: "docker" "start" "-a" "4260c96643f4a65555cd2b33d5c07afc27e9f1c168a24f2af820fe59811100c6", kill_on_drop: false }`
[INFO] [stderr] warning: library `mock_me` should only specify `proc-macro = true` instead of setting `crate-type`
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling mock_me_test_context v0.1.2
[INFO] [stderr]    Compiling mock_me v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:47:1
[INFO] [stdout]    |
[INFO] [stdout] 47 | #![feature(proc_macro)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[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 `mock_me` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "4260c96643f4a65555cd2b33d5c07afc27e9f1c168a24f2af820fe59811100c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4260c96643f4a65555cd2b33d5c07afc27e9f1c168a24f2af820fe59811100c6", kill_on_drop: false }`
[INFO] [stdout] 4260c96643f4a65555cd2b33d5c07afc27e9f1c168a24f2af820fe59811100c6