[INFO] cloning repository https://github.com/nihilistkitten/m3lc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nihilistkitten/m3lc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnihilistkitten%2Fm3lc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnihilistkitten%2Fm3lc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 78a855ece3790247864bd01bfa1a5459c674a3bb
[INFO] testing nihilistkitten/m3lc against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnihilistkitten%2Fm3lc" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nihilistkitten/m3lc 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] removed /workspace/builds/worker-4/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/nihilistkitten/m3lc
[INFO] finished tweaking git repo https://github.com/nihilistkitten/m3lc
[INFO] tweaked toml for git repo https://github.com/nihilistkitten/m3lc written to /workspace/builds/worker-4/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] c2b0b9c9622c69413bd55bc3c545d2d79ead34b2378a310ed3e4cc81ce687699
[INFO] running `Command { std: "docker" "start" "-a" "c2b0b9c9622c69413bd55bc3c545d2d79ead34b2378a310ed3e4cc81ce687699", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c2b0b9c9622c69413bd55bc3c545d2d79ead34b2378a310ed3e4cc81ce687699", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2b0b9c9622c69413bd55bc3c545d2d79ead34b2378a310ed3e4cc81ce687699", kill_on_drop: false }`
[INFO] [stdout] c2b0b9c9622c69413bd55bc3c545d2d79ead34b2378a310ed3e4cc81ce687699
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 60fb81be3b65fa372d6c487cc4b07f669937e1b27c00bfbc56a9e43c21916756
[INFO] running `Command { std: "docker" "start" "-a" "60fb81be3b65fa372d6c487cc4b07f669937e1b27c00bfbc56a9e43c21916756", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling libc v0.2.123
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling colored v2.0.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]    Compiling pest_consume_macros v1.1.0
[INFO] [stderr]    Compiling pest_consume v1.1.1
[INFO] [stderr]    Compiling structopt v0.3.26
[INFO] [stderr]    Compiling m3lc 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_patterns, box_syntax, test)]
[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 `m3lc` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "60fb81be3b65fa372d6c487cc4b07f669937e1b27c00bfbc56a9e43c21916756", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60fb81be3b65fa372d6c487cc4b07f669937e1b27c00bfbc56a9e43c21916756", kill_on_drop: false }`
[INFO] [stdout] 60fb81be3b65fa372d6c487cc4b07f669937e1b27c00bfbc56a9e43c21916756