[INFO] cloning repository https://github.com/xiongmao86/mmix-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xiongmao86/mmix-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxiongmao86%2Fmmix-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxiongmao86%2Fmmix-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 91df132fad6ba08a7288317a3a8c06bbcadcd781
[INFO] testing xiongmao86/mmix-rust against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxiongmao86%2Fmmix-rust" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/xiongmao86/mmix-rust on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/xiongmao86/mmix-rust
[INFO] finished tweaking git repo https://github.com/xiongmao86/mmix-rust
[INFO] tweaked toml for git repo https://github.com/xiongmao86/mmix-rust written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/xiongmao86/mmix-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 05b9edeb93f5fe79b5e3a101afc9e1d78495529db8f3aa2b50f1f7ee98231938
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "05b9edeb93f5fe79b5e3a101afc9e1d78495529db8f3aa2b50f1f7ee98231938", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "05b9edeb93f5fe79b5e3a101afc9e1d78495529db8f3aa2b50f1f7ee98231938", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05b9edeb93f5fe79b5e3a101afc9e1d78495529db8f3aa2b50f1f7ee98231938", kill_on_drop: false }`
[INFO] [stdout] 05b9edeb93f5fe79b5e3a101afc9e1d78495529db8f3aa2b50f1f7ee98231938
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9f813d579ae08edc9cc7f1ac748de3e65262ab5dbbb6b35ae96b9687a07aef2a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9f813d579ae08edc9cc7f1ac748de3e65262ab5dbbb6b35ae96b9687a07aef2a", kill_on_drop: false }`
[INFO] [stderr]    Compiling mmix 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(associated_type_bounds)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashMemory`
[INFO] [stdout]  --> src/machine/mod.rs:2:23
[INFO] [stdout]   |
[INFO] [stdout] 2 | use memory::{ Memory, HashMemory };
[INFO] [stdout]   |                       ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` 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 `mmix`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "9f813d579ae08edc9cc7f1ac748de3e65262ab5dbbb6b35ae96b9687a07aef2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f813d579ae08edc9cc7f1ac748de3e65262ab5dbbb6b35ae96b9687a07aef2a", kill_on_drop: false }`
[INFO] [stdout] 9f813d579ae08edc9cc7f1ac748de3e65262ab5dbbb6b35ae96b9687a07aef2a