[INFO] cloning repository https://github.com/foeb/buddy
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/foeb/buddy" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffoeb%2Fbuddy", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffoeb%2Fbuddy'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b0b909fde29fdb83eeb1b7eb698b7e366a5302c7
[INFO] testing foeb/buddy against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffoeb%2Fbuddy" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/foeb/buddy 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/foeb/buddy
[INFO] finished tweaking git repo https://github.com/foeb/buddy
[INFO] tweaked toml for git repo https://github.com/foeb/buddy written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/foeb/buddy 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]  Downloading crates ...
[INFO] [stderr]   Downloaded thiserror-impl v1.0.11
[INFO] [stderr]   Downloaded tracing-attributes v0.1.7
[INFO] [stderr]   Downloaded sdl2 v0.33.0
[INFO] [stderr]   Downloaded tracing-core v0.1.10
[INFO] [stderr]   Downloaded tracing v0.1.13
[INFO] [stderr]   Downloaded thiserror v1.0.11
[INFO] [stderr]   Downloaded sdl2-sys v0.33.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7c99162a6e421a5f09b841b686b8a437b9354417788abb5ba7b686f343b18b63
[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" "7c99162a6e421a5f09b841b686b8a437b9354417788abb5ba7b686f343b18b63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7c99162a6e421a5f09b841b686b8a437b9354417788abb5ba7b686f343b18b63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c99162a6e421a5f09b841b686b8a437b9354417788abb5ba7b686f343b18b63", kill_on_drop: false }`
[INFO] [stdout] 7c99162a6e421a5f09b841b686b8a437b9354417788abb5ba7b686f343b18b63
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 499542f2655c703c709753aa1e90196b615572f5093a8ae4ba9401c8fecad3c7
[INFO] running `Command { std: "docker" "start" "-a" "499542f2655c703c709753aa1e90196b615572f5093a8ae4ba9401c8fecad3c7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling rayon-core v1.7.0
[INFO] [stderr]    Compiling smallvec v1.2.0
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]    Compiling ryu v1.0.3
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling bit-vec v0.5.1
[INFO] [stderr]    Compiling sdl2 v0.33.0
[INFO] [stderr]    Compiling sdl2-sys v0.33.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling tracing-core v0.1.10
[INFO] [stderr]    Compiling lock_api v0.3.3
[INFO] [stderr]    Compiling bit-set v0.5.1
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling num_cpus v1.12.0
[INFO] [stderr]    Compiling memoffset v0.5.3
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling parking_lot_core v0.7.0
[INFO] [stderr]    Compiling parking_lot v0.10.0
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling crossbeam-queue v0.2.1
[INFO] [stderr]    Compiling crossbeam-channel v0.4.2
[INFO] [stderr]    Compiling crossbeam-deque v0.7.3
[INFO] [stderr]    Compiling rayon v1.3.0
[INFO] [stderr]    Compiling derivative v1.0.4
[INFO] [stderr]    Compiling tracing-attributes v0.1.7
[INFO] [stderr]    Compiling thiserror-impl v1.0.11
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling thiserror v1.0.11
[INFO] [stderr]    Compiling paste-impl v0.1.7
[INFO] [stderr]    Compiling tracing v0.1.13
[INFO] [stderr]    Compiling legion-core v0.2.1 (https://github.com/foeb/legion?branch=impl_as_mut#4ae57325)
[INFO] [stderr]    Compiling paste v0.1.7
[INFO] [stderr]    Compiling legion-systems v0.2.1 (https://github.com/foeb/legion?branch=impl_as_mut#4ae57325)
[INFO] [stderr]    Compiling serde_json v1.0.48
[INFO] [stderr]    Compiling legion v0.2.1 (https://github.com/foeb/legion?branch=impl_as_mut#4ae57325)
[INFO] [stderr]    Compiling buddy 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(box_syntax)]
[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 `buddy`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "499542f2655c703c709753aa1e90196b615572f5093a8ae4ba9401c8fecad3c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "499542f2655c703c709753aa1e90196b615572f5093a8ae4ba9401c8fecad3c7", kill_on_drop: false }`
[INFO] [stdout] 499542f2655c703c709753aa1e90196b615572f5093a8ae4ba9401c8fecad3c7