[INFO] fetching crate groupfiles 0.1.0...
[INFO] testing groupfiles-0.1.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate groupfiles 0.1.0 into /workspace/builds/worker-54/source
[INFO] validating manifest of crates.io crate groupfiles 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 groupfiles 0.1.0
[INFO] finished tweaking crates.io crate groupfiles 0.1.0
[INFO] tweaked toml for crates.io crate groupfiles 0.1.0 written to /workspace/builds/worker-54/source/Cargo.toml
[INFO] crate crates.io crate groupfiles 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unicode-width v0.1.7
[INFO] [stderr]   Downloaded regex-syntax v0.6.17
[INFO] [stderr]   Downloaded clap v2.33.1
[INFO] [stderr]   Downloaded regex v1.3.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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] 6b9046dbe77a29204033d1d4fae1693bba6120e3cd857b376f194401435edd3e
[INFO] running `Command { std: "docker" "start" "-a" "6b9046dbe77a29204033d1d4fae1693bba6120e3cd857b376f194401435edd3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6b9046dbe77a29204033d1d4fae1693bba6120e3cd857b376f194401435edd3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b9046dbe77a29204033d1d4fae1693bba6120e3cd857b376f194401435edd3e", kill_on_drop: false }`
[INFO] [stdout] 6b9046dbe77a29204033d1d4fae1693bba6120e3cd857b376f194401435edd3e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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] f00b066553005380f37de6a228a3b6fbe186d6392ca88165e3999e819a844a3f
[INFO] running `Command { std: "docker" "start" "-a" "f00b066553005380f37de6a228a3b6fbe186d6392ca88165e3999e819a844a3f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling unicode-width v0.1.7
[INFO] [stderr]    Compiling regex-syntax v0.6.17
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling regex v1.3.7
[INFO] [stderr]    Compiling clap v2.33.1
[INFO] [stderr]    Compiling groupfiles v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(clamp)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `clamp` has been stable since 1.50.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(clamp)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `groupfiles` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "f00b066553005380f37de6a228a3b6fbe186d6392ca88165e3999e819a844a3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f00b066553005380f37de6a228a3b6fbe186d6392ca88165e3999e819a844a3f", kill_on_drop: false }`
[INFO] [stdout] f00b066553005380f37de6a228a3b6fbe186d6392ca88165e3999e819a844a3f