[INFO] fetching crate signalr_rs 0.1.4...
[INFO] testing signalr_rs-0.1.4 against 1.55.0 for beta-1.56-1
[INFO] extracting crate signalr_rs 0.1.4 into /workspace/builds/worker-15/source
[INFO] validating manifest of crates.io crate signalr_rs 0.1.4 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate signalr_rs 0.1.4
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate signalr_rs 0.1.4
[INFO] tweaked toml for crates.io crate signalr_rs 0.1.4 written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate crates.io crate signalr_rs 0.1.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 84bf9891b464161fd06e86771c46d3a8279c000c7638d00d29418c11ef9c5295
[INFO] running `Command { std: "docker" "start" "-a" "84bf9891b464161fd06e86771c46d3a8279c000c7638d00d29418c11ef9c5295", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "84bf9891b464161fd06e86771c46d3a8279c000c7638d00d29418c11ef9c5295", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84bf9891b464161fd06e86771c46d3a8279c000c7638d00d29418c11ef9c5295", kill_on_drop: false }`
[INFO] [stdout] 84bf9891b464161fd06e86771c46d3a8279c000c7638d00d29418c11ef9c5295
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5624d659e59bb6cbb2d210075d0101730ffa79de3788d0774f2f79cce7a6e6e9
[INFO] running `Command { std: "docker" "start" "-a" "5624d659e59bb6cbb2d210075d0101730ffa79de3788d0774f2f79cce7a6e6e9", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core v0.3.14
[INFO] [stderr]    Compiling futures-sink v0.3.14
[INFO] [stderr]    Compiling futures-io v0.3.14
[INFO] [stderr]    Compiling futures-task v0.3.14
[INFO] [stderr]    Compiling once_cell v1.7.2
[INFO] [stderr]    Compiling openssl v0.10.33
[INFO] [stderr]    Compiling const_fn v0.4.7
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling httparse v1.4.0
[INFO] [stderr]    Compiling rle-decode-fast v1.0.1
[INFO] [stderr]    Compiling object v0.23.0
[INFO] [stderr]    Compiling openssl-sys v0.9.61
[INFO] [stderr]    Compiling tokio v1.5.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.3
[INFO] [stderr]    Compiling idna v0.2.3
[INFO] [stderr]    Compiling tracing v0.1.25
[INFO] [stderr]    Compiling mio v0.7.11
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling futures-macro v0.3.14
[INFO] [stderr]    Compiling pin-project-internal v1.0.7
[INFO] [stderr]    Compiling async-trait v0.1.50
[INFO] [stderr]    Compiling actix-macros v0.2.0
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling actix_derive v0.6.0
[INFO] [stderr]    Compiling env_logger v0.8.3
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling actix-router v0.2.7
[INFO] [stderr]    Compiling futures-channel v0.3.14
[INFO] [stderr]    Compiling actix-threadpool v0.3.3
[INFO] [stderr]    Compiling libflate_lz77 v1.1.0
[INFO] [stderr]    Compiling url v2.2.1
[INFO] [stderr]    Compiling libflate v1.1.0
[INFO] [stderr]    Compiling rand_core v0.6.2
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[INFO] [stderr]    Compiling tokio v0.2.25
[INFO] [stderr]    Compiling rand_chacha v0.3.0
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[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling futures-util v0.3.14
[INFO] [stderr]    Compiling backoff v0.3.0
[INFO] [stderr]    Compiling cookie v0.14.4
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling pin-project v1.0.7
[INFO] [stderr]    Compiling tracing-futures v0.2.5
[INFO] [stderr]    Compiling tokio-util v0.6.6
[INFO] [stderr]    Compiling actix-rt v2.2.0
[INFO] [stderr]    Compiling tokio-util v0.3.1
[INFO] [stderr]    Compiling tokio-openssl v0.4.0
[INFO] [stderr]    Compiling actix-codec v0.3.0
[INFO] [stderr]    Compiling actix-service v1.0.6
[INFO] [stderr]    Compiling actix-rt v1.1.1
[INFO] [stderr]    Compiling futures-executor v0.3.14
[INFO] [stderr]    Compiling h2 v0.2.7
[INFO] [stderr]    Compiling actix v0.11.1
[INFO] [stderr]    Compiling futures v0.3.14
[INFO] [stderr]    Compiling trust-dns-proto v0.19.7
[INFO] [stderr]    Compiling actix-utils v2.0.0
[INFO] [stderr]    Compiling actix-tls v2.0.0
[INFO] [stderr]    Compiling actix-server v1.0.4
[INFO] [stderr]    Compiling actix-testing v1.0.1
[INFO] [stderr]    Compiling trust-dns-resolver v0.19.7
[INFO] [stderr]    Compiling actix-connect v2.0.0
[INFO] [stderr]    Compiling actix-http v2.2.0
[INFO] [stderr]    Compiling awc v2.0.3
[INFO] [stderr]    Compiling actix-web v3.3.2
[INFO] [stderr]    Compiling signalr_rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]   --> src/hub/client.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use std::option::NoneError;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/hub/client.rs:197:17
[INFO] [stdout]     |
[INFO] [stdout] 197 |             let mut ssl =
[INFO] [stdout]     |                 ----^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `signalr_rs` due to 3 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "5624d659e59bb6cbb2d210075d0101730ffa79de3788d0774f2f79cce7a6e6e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5624d659e59bb6cbb2d210075d0101730ffa79de3788d0774f2f79cce7a6e6e9", kill_on_drop: false }`
[INFO] [stdout] 5624d659e59bb6cbb2d210075d0101730ffa79de3788d0774f2f79cce7a6e6e9