[INFO] cloning repository https://github.com/mknet/rust-mocktopus-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mknet/rust-mocktopus-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmknet%2Frust-mocktopus-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmknet%2Frust-mocktopus-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bee15a86464f38a1d29be7d666a87c52ccc27626
[INFO] testing mknet/rust-mocktopus-playground against 1.54.0 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmknet%2Frust-mocktopus-playground" "/workspace/builds/worker-73/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-73/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mknet/rust-mocktopus-playground on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mknet/rust-mocktopus-playground
[INFO] finished tweaking git repo https://github.com/mknet/rust-mocktopus-playground
[INFO] tweaked toml for git repo https://github.com/mknet/rust-mocktopus-playground written to /workspace/builds/worker-73/source/Cargo.toml
[INFO] crate git repo https://github.com/mknet/rust-mocktopus-playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mocktopus_macros v0.7.5
[INFO] [stderr]   Downloaded mocktopus v0.7.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 08a0e9b834ec8b127e07445de78fbc66d3a80bbe30fcaa10d71e5334f3f4e7eb
[INFO] running `Command { std: "docker" "start" "-a" "08a0e9b834ec8b127e07445de78fbc66d3a80bbe30fcaa10d71e5334f3f4e7eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "08a0e9b834ec8b127e07445de78fbc66d3a80bbe30fcaa10d71e5334f3f4e7eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08a0e9b834ec8b127e07445de78fbc66d3a80bbe30fcaa10d71e5334f3f4e7eb", kill_on_drop: false }`
[INFO] [stdout] 08a0e9b834ec8b127e07445de78fbc66d3a80bbe30fcaa10d71e5334f3f4e7eb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f72fbcab0f53ed1252b5adfe4ca0d5bb582aa7a00855b4282cf41e77f1d091cc
[INFO] running `Command { std: "docker" "start" "-a" "f72fbcab0f53ed1252b5adfe4ca0d5bb582aa7a00855b4282cf41e77f1d091cc", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling mocktopus_macros v0.7.5
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mocktopus_macros-0.7.5/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(proc_macro_diagnostic)]
[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 `mocktopus_macros`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "f72fbcab0f53ed1252b5adfe4ca0d5bb582aa7a00855b4282cf41e77f1d091cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f72fbcab0f53ed1252b5adfe4ca0d5bb582aa7a00855b4282cf41e77f1d091cc", kill_on_drop: false }`
[INFO] [stdout] f72fbcab0f53ed1252b5adfe4ca0d5bb582aa7a00855b4282cf41e77f1d091cc
