[INFO] fetching crate webcord 0.0.0...
[INFO] testing webcord-0.0.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate webcord 0.0.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate webcord 0.0.0 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 crates.io crate webcord 0.0.0
[INFO] finished tweaking crates.io crate webcord 0.0.0
[INFO] tweaked toml for crates.io crate webcord 0.0.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate webcord 0.0.0 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] 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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 226672dc7037badd4a6468d19185346695b224788923678c6cf294125e67e1a9
[INFO] running `Command { std: "docker" "start" "-a" "226672dc7037badd4a6468d19185346695b224788923678c6cf294125e67e1a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "226672dc7037badd4a6468d19185346695b224788923678c6cf294125e67e1a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "226672dc7037badd4a6468d19185346695b224788923678c6cf294125e67e1a9", kill_on_drop: false }`
[INFO] [stdout] 226672dc7037badd4a6468d19185346695b224788923678c6cf294125e67e1a9
[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] c4751bf8f62a5ab786e30fba81ec52be7eb00be76c3d7248c10f22ffe507a4c0
[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" "c4751bf8f62a5ab786e30fba81ec52be7eb00be76c3d7248c10f22ffe507a4c0", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v1.0.0
[INFO] [stderr]    Compiling bytes v0.5.2
[INFO] [stderr]    Compiling serde v1.0.103
[INFO] [stderr]    Compiling arc-swap v0.4.4
[INFO] [stderr]    Compiling copyless v0.1.4
[INFO] [stderr]    Compiling dtoa v0.4.4
[INFO] [stderr]    Compiling adler32 v1.0.4
[INFO] [stderr]    Compiling alloc-no-stdlib v2.0.1
[INFO] [stderr]    Compiling ucd-trie v0.1.2
[INFO] [stderr]    Compiling v_htmlescape v0.4.5
[INFO] [stderr]    Compiling utf-8 v0.7.5
[INFO] [stderr]    Compiling same-file v1.0.5
[INFO] [stderr]    Compiling serenity v0.7.3
[INFO] [stderr]    Compiling uwl v0.4.2
[INFO] [stderr]    Compiling dotenv v0.15.0
[INFO] [stderr]    Compiling lock_api v0.3.2
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling ring v0.16.9
[INFO] [stderr]    Compiling crossbeam-utils v0.7.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.0
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling futures-channel v0.3.1
[INFO] [stderr]    Compiling tokio-sync v0.1.7
[INFO] [stderr]    Compiling error-chain v0.12.1
[INFO] [stderr]    Compiling nom v5.0.1
[INFO] [stderr]    Compiling lru-cache v0.1.2
[INFO] [stderr]    Compiling miniz_oxide v0.3.5
[INFO] [stderr]    Compiling alloc-stdlib v0.2.1
[INFO] [stderr]    Compiling tokio-executor v0.1.9
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling unicode-normalization v0.1.11
[INFO] [stderr]    Compiling pest v2.1.2
[INFO] [stderr]    Compiling walkdir v2.2.9
[INFO] [stderr]    Compiling num_cpus v1.11.1
[INFO] [stderr]    Compiling getrandom v0.1.13
[INFO] [stderr]    Compiling hostname v0.1.5
[INFO] [stderr]    Compiling socket2 v0.3.11
[INFO] [stderr]    Compiling want v0.2.0
[INFO] [stderr]    Compiling memoffset v0.5.3
[INFO] [stderr]    Compiling lexical-core v0.4.6
[INFO] [stderr]    Compiling base64 v0.10.1
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling http v0.2.0
[INFO] [stderr]    Compiling bytestring v0.1.1
[INFO] [stderr]    Compiling signal-hook-registry v1.2.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling mio v0.6.21
[INFO] [stderr]    Compiling brotli-decompressor v2.3.0
[INFO] [stderr]    Compiling tokio-current-thread v0.1.6
[INFO] [stderr]    Compiling tokio-timer v0.2.12
[INFO] [stderr]    Compiling resolv-conf v0.6.2
[INFO] [stderr]    Compiling threadpool v1.7.1
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling mime_guess v2.0.1
[INFO] [stderr]    Compiling serde_derive v1.0.103
[INFO] [stderr]    Compiling derive_more v0.99.2
[INFO] [stderr]    Compiling actix-macros v0.1.0
[INFO] [stderr]    Compiling async-trait v0.1.21
[INFO] [stderr]    Compiling enum-as-inner v0.3.0
[INFO] [stderr]    Compiling actix-web-codegen v0.2.0-alpha.2
[INFO] [stderr]    Compiling dirmod-codegen v0.2.0-alpha.1
[INFO] [stderr]    Compiling command_attr v0.1.5
[INFO] [stderr]    Compiling getset v0.0.9
[INFO] [stderr]    Compiling env_logger v0.6.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/dirmod-codegen-0.2.0-alpha.1/src/lib.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(proc_macro_span)]
[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 `dirmod-codegen`
[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] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c4751bf8f62a5ab786e30fba81ec52be7eb00be76c3d7248c10f22ffe507a4c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4751bf8f62a5ab786e30fba81ec52be7eb00be76c3d7248c10f22ffe507a4c0", kill_on_drop: false }`
[INFO] [stdout] c4751bf8f62a5ab786e30fba81ec52be7eb00be76c3d7248c10f22ffe507a4c0