[INFO] cloning repository https://github.com/Windfisch/loopfisch
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Windfisch/loopfisch" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWindfisch%2Floopfisch", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWindfisch%2Floopfisch'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c3b04b3fd54b9f00fca8acedd64e17e3ae6a9f1a
[INFO] testing Windfisch/loopfisch against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWindfisch%2Floopfisch" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Windfisch/loopfisch 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/Windfisch/loopfisch
[INFO] finished tweaking git repo https://github.com/Windfisch/loopfisch
[INFO] tweaked toml for git repo https://github.com/Windfisch/loopfisch written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/Windfisch/loopfisch 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] [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-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 2000fcb5e1fa7b334c044ede683de785fa53fb332c622a8ae99d4f31777343ae
[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" "2000fcb5e1fa7b334c044ede683de785fa53fb332c622a8ae99d4f31777343ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2000fcb5e1fa7b334c044ede683de785fa53fb332c622a8ae99d4f31777343ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2000fcb5e1fa7b334c044ede683de785fa53fb332c622a8ae99d4f31777343ae", kill_on_drop: false }`
[INFO] [stdout] 2000fcb5e1fa7b334c044ede683de785fa53fb332c622a8ae99d4f31777343ae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] aef5f6a3403340c3901a54b9db2947dcb63023ecf1a2bdf93970a59c539e8e0d
[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" "aef5f6a3403340c3901a54b9db2947dcb63023ecf1a2bdf93970a59c539e8e0d", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.55
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling futures-io v0.3.8
[INFO] [stderr]    Compiling inlinable_string v0.1.14
[INFO] [stderr]    Compiling state v0.4.2
[INFO] [stderr]    Compiling binascii v0.1.4
[INFO] [stderr]    Compiling gen-iter v0.2.0 (https://github.com/Windfisch/gen-iter#87fdc268)
[INFO] [stderr]    Compiling ringbuf v0.2.2
[INFO] [stderr]    Compiling assert_no_alloc v1.1.0 (https://github.com/Windfisch/rust-assert-no-alloc#deacecf3)
[INFO] [stderr]    Compiling proc-macro2-diagnostics v0.9.1
[INFO] [stderr]    Compiling uncased v0.9.3
[INFO] [stderr]    Compiling time v0.2.23
[INFO] [stderr]    Compiling cookie v0.15.0-dev (https://github.com/SergioBenitez/cookie-rs.git?rev=1c3ca83#1c3ca838)
[INFO] [stderr]    Compiling rocket_http v0.5.0-dev (https://github.com/SergioBenitez/Rocket?branch=master#1f1f44f3)
[INFO] [stderr]    Compiling atomic v0.5.0
[INFO] [stderr]    Compiling figment v0.9.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/git/checkouts/rust-assert-no-alloc-c1cae25abd4b4222/deacecf/src/lib.rs:24:1
[INFO] [stdout]    |
[INFO] [stdout] 24 | #![feature(external_doc)]
[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 `assert_no_alloc`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/git/checkouts/gen-iter-9b50b3a839fcacfd/87fdc26/src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | #![feature(generators, generator_trait)]
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "aef5f6a3403340c3901a54b9db2947dcb63023ecf1a2bdf93970a59c539e8e0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aef5f6a3403340c3901a54b9db2947dcb63023ecf1a2bdf93970a59c539e8e0d", kill_on_drop: false }`
[INFO] [stdout] aef5f6a3403340c3901a54b9db2947dcb63023ecf1a2bdf93970a59c539e8e0d