[INFO] fetching crate mcf-config-demo-settings 0.1.0...
[INFO] testing mcf-config-demo-settings-0.1.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate mcf-config-demo-settings 0.1.0 into /workspace/builds/worker-75/source
[INFO] validating manifest of crates.io crate mcf-config-demo-settings 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 mcf-config-demo-settings 0.1.0
[INFO] finished tweaking crates.io crate mcf-config-demo-settings 0.1.0
[INFO] tweaked toml for crates.io crate mcf-config-demo-settings 0.1.0 written to /workspace/builds/worker-75/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "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" "+1.59.0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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] a1f6278792b1dc0db9eb8973e3d553a583484cc3ee97aaefbb3a856aa1dab979
[INFO] running `Command { std: "docker" "start" "-a" "a1f6278792b1dc0db9eb8973e3d553a583484cc3ee97aaefbb3a856aa1dab979", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a1f6278792b1dc0db9eb8973e3d553a583484cc3ee97aaefbb3a856aa1dab979", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1f6278792b1dc0db9eb8973e3d553a583484cc3ee97aaefbb3a856aa1dab979", kill_on_drop: false }`
[INFO] [stdout] a1f6278792b1dc0db9eb8973e3d553a583484cc3ee97aaefbb3a856aa1dab979
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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] 65c5319c239fa96e7fb8f0600d4d7ffc4282e99a528c237eb2481fd061946425
[INFO] running `Command { std: "docker" "start" "-a" "65c5319c239fa96e7fb8f0600d4d7ffc4282e99a528c237eb2481fd061946425", kill_on_drop: false }`
[INFO] [stderr]    Compiling mcf-config-demo-settings 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(min_const_fn)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `min_const_fn` has been stable since 1.31.0 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 `mcf-config-demo-settings` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "65c5319c239fa96e7fb8f0600d4d7ffc4282e99a528c237eb2481fd061946425", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65c5319c239fa96e7fb8f0600d4d7ffc4282e99a528c237eb2481fd061946425", kill_on_drop: false }`
[INFO] [stdout] 65c5319c239fa96e7fb8f0600d4d7ffc4282e99a528c237eb2481fd061946425