[INFO] fetching crate solitaire-controllers 0.0.1...
[INFO] testing solitaire-controllers-0.0.1 against 1.49.0 for beta-1.50-1
[INFO] extracting crate solitaire-controllers 0.0.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate solitaire-controllers 0.0.1 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 solitaire-controllers 0.0.1
[INFO] finished tweaking crates.io crate solitaire-controllers 0.0.1
[INFO] tweaked toml for crates.io crate solitaire-controllers 0.0.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] af8c12b829637073d25dd30fc6ea7000d23ceb16a766e3e9f137539a0b2ea89d
[INFO] running `Command { std: "docker" "start" "-a" "af8c12b829637073d25dd30fc6ea7000d23ceb16a766e3e9f137539a0b2ea89d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "af8c12b829637073d25dd30fc6ea7000d23ceb16a766e3e9f137539a0b2ea89d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af8c12b829637073d25dd30fc6ea7000d23ceb16a766e3e9f137539a0b2ea89d", kill_on_drop: false }`
[INFO] [stdout] af8c12b829637073d25dd30fc6ea7000d23ceb16a766e3e9f137539a0b2ea89d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] da3f35fb94dfa46bc8600c57e720bc44958c8bd5deded164cf528e0204fdacec
[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" "da3f35fb94dfa46bc8600c57e720bc44958c8bd5deded164cf528e0204fdacec", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling syn v1.0.57
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]    Compiling getrandom v0.2.1
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]    Compiling copyless v0.1.5
[INFO] [stderr]    Compiling match_cfg v0.1.0
[INFO] [stderr]    Compiling linked-hash-map v0.5.3
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling encoding_rs v0.8.26
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling untrusted v0.6.2
[INFO] [stderr]    Compiling dtoa v0.4.7
[INFO] [stderr]    Compiling sha1 v0.6.0
[INFO] [stderr]    Compiling language-tags v0.2.2
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]    Compiling maud_htmlescape v0.17.0
[INFO] [stderr]    Compiling hashbrown v0.3.1
[INFO] [stderr]    Compiling hashbrown v0.5.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling actix-service v0.4.2
[INFO] [stderr]    Compiling indexmap v1.6.1
[INFO] [stderr]    Compiling tokio-sync v0.1.8
[INFO] [stderr]    Compiling hashbrown v0.6.3
[INFO] [stderr]    Compiling lock_api v0.2.0
[INFO] [stderr]    Compiling lru-cache v0.1.2
[INFO] [stderr]    Compiling rust-embed-utils v5.1.0
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]    Compiling parking_lot v0.8.0
[INFO] [stderr]    Compiling smallvec v0.6.13
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling net2 v0.2.37
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling backtrace v0.3.55
[INFO] [stderr]    Compiling socket2 v0.3.19
[INFO] [stderr]    Compiling hostname v0.3.1
[INFO] [stderr]    Compiling signal-hook-registry v1.3.0
[INFO] [stderr]    Compiling dirs-sys-next v0.1.1
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling tokio-executor v0.1.10
[INFO] [stderr]    Compiling threadpool v1.8.1
[INFO] [stderr]    Compiling cc v1.0.66
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling const-random-macro v0.1.13
[INFO] [stderr]    Compiling resolv-conf v0.6.3
[INFO] [stderr]    Compiling dirs-next v2.0.0
[INFO] [stderr]    Compiling tokio-timer v0.2.13
[INFO] [stderr]    Compiling tokio-current-thread v0.1.7
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling tokio-io v0.1.13
[INFO] [stderr]    Compiling http v0.1.21
[INFO] [stderr]    Compiling string v0.2.1
[INFO] [stderr]    Compiling shellexpand v2.1.0
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling const-random v0.1.13
[INFO] [stderr]    Compiling tokio-reactor v0.1.12
[INFO] [stderr]    Compiling tokio-codec v0.1.2
[INFO] [stderr]    Compiling ahash v0.2.19
[INFO] [stderr]    Compiling actix-codec v0.1.2
[INFO] [stderr]    Compiling libz-sys v1.1.2
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling libgit2-sys v0.9.2
[INFO] [stderr]    Compiling ring v0.14.6
[INFO] [stderr]    Compiling actix-utils v0.4.7
[INFO] [stderr]    Compiling tokio-tcp v0.1.4
[INFO] [stderr]    Compiling tokio-udp v0.1.6
[INFO] [stderr]    Compiling tokio-signal v0.2.9
[INFO] [stderr]    Compiling actix-server-config v0.1.2
[INFO] [stderr]    Compiling flate2 v1.0.19
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling h2 v0.1.26
[INFO] [stderr]    Compiling brotli2 v0.3.2
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling derive_more v0.99.11
[INFO] [stderr]    Compiling actix-web-codegen v0.1.3
[INFO] [stderr]    Compiling rust-embed-impl v5.7.0
[INFO] [stderr]    Compiling derive_more v0.15.0
[INFO] [stderr]    Compiling enum-as-inner v0.2.1
[INFO] [stderr]    Compiling actix_derive v0.4.0
[INFO] [stderr]    Compiling maud_macros v0.21.0
[INFO] [stderr]    Compiling derive_more v0.14.1
[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/maud_macros-0.21.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_def_site)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/maud_macros-0.21.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(proc_macro_diagnostic)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/maud_macros-0.21.0/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(proc_macro_hygiene)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/maud_macros-0.21.0/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(proc_macro_quote)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/maud_macros-0.21.0/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(proc_macro_span)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `maud_macros`
[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" "da3f35fb94dfa46bc8600c57e720bc44958c8bd5deded164cf528e0204fdacec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da3f35fb94dfa46bc8600c57e720bc44958c8bd5deded164cf528e0204fdacec", kill_on_drop: false }`
[INFO] [stdout] da3f35fb94dfa46bc8600c57e720bc44958c8bd5deded164cf528e0204fdacec