[INFO] cloning repository https://github.com/fangerm/gelixrs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fangerm/gelixrs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffangerm%2Fgelixrs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffangerm%2Fgelixrs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5555b882634c763eb812671a83161bcd369b1a5b
[INFO] testing fangerm/gelixrs against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffangerm%2Fgelixrs" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fangerm/gelixrs 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/fangerm/gelixrs
[INFO] finished tweaking git repo https://github.com/fangerm/gelixrs
[INFO] tweaked toml for git repo https://github.com/fangerm/gelixrs written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/fangerm/gelixrs 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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 939fcbe053fd7e15e2062a7329af3e50693ebdfdd6af5c62cb4a94246af55553
[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" "939fcbe053fd7e15e2062a7329af3e50693ebdfdd6af5c62cb4a94246af55553", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "939fcbe053fd7e15e2062a7329af3e50693ebdfdd6af5c62cb4a94246af55553", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "939fcbe053fd7e15e2062a7329af3e50693ebdfdd6af5c62cb4a94246af55553", kill_on_drop: false }`
[INFO] [stdout] 939fcbe053fd7e15e2062a7329af3e50693ebdfdd6af5c62cb4a94246af55553
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] af4d38c556b3e19004d0019ab49aa8fe426a44b83d56dbfd50d5c058808ff329
[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" "af4d38c556b3e19004d0019ab49aa8fe426a44b83d56dbfd50d5c058808ff329", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling inkwell v0.1.0 (https://github.com/TheDan64/inkwell?rev=136dd5e06db47f77cb329cd5f6625273dfd3afd7#136dd5e0)
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling serde v1.0.103
[INFO] [stderr]    Compiling dirs-sys v0.3.4
[INFO] [stderr]    Compiling enum-methods v0.0.8
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling llvm-sys v80.1.2
[INFO] [stderr]    Compiling dirs v2.0.2
[INFO] [stderr]    Compiling toml v0.4.10
[INFO] [stderr]    Compiling serde_derive v1.0.103
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]    Compiling structopt v0.2.18
[INFO] [stderr]    Compiling cargo_toml v0.6.4
[INFO] [stderr]    Compiling inkwell_internal_macros v0.1.0 (https://github.com/TheDan64/inkwell?rev=136dd5e06db47f77cb329cd5f6625273dfd3afd7#136dd5e0)
[INFO] [stderr]    Compiling gelixrs 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:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(drain_filter)]
[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 `gelixrs`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "af4d38c556b3e19004d0019ab49aa8fe426a44b83d56dbfd50d5c058808ff329", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af4d38c556b3e19004d0019ab49aa8fe426a44b83d56dbfd50d5c058808ff329", kill_on_drop: false }`
[INFO] [stdout] af4d38c556b3e19004d0019ab49aa8fe426a44b83d56dbfd50d5c058808ff329