[INFO] cloning repository https://github.com/iovxw/rssbot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iovxw/rssbot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Frssbot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Frssbot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 84b1e9973760b0233c17f18d0670c5987c7d8259
[INFO] testing iovxw/rssbot against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Frssbot" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iovxw/rssbot 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 git repo https://github.com/iovxw/rssbot
[INFO] finished tweaking git repo https://github.com/iovxw/rssbot
[INFO] tweaked toml for git repo https://github.com/iovxw/rssbot written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/iovxw/rssbot 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 }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pmutil v0.5.3
[INFO] [stderr]   Downloaded pin-project-internal v0.4.26
[INFO] [stderr]   Downloaded atomicwrites v0.3.0
[INFO] [stderr]   Downloaded async-socks5 v0.5.0
[INFO] [stderr]   Downloaded quick-xml v0.20.0
[INFO] [stderr]   Downloaded async-compression v0.3.7
[INFO] [stderr]   Downloaded schannel v0.1.18
[INFO] [stderr]   Downloaded tracing-attributes v0.1.13
[INFO] [stderr]   Downloaded ctl10n v0.2.0
[INFO] [stderr]   Downloaded pinyin v0.8.0
[INFO] [stderr]   Downloaded type-map v0.5.0
[INFO] [stderr]   Downloaded is-macro v0.1.9
[INFO] [stderr]   Downloaded pin-project v0.4.26
[INFO] [stderr]   Downloaded ntapi v0.3.4
[INFO] [stderr]   Downloaded hyper-socks2 v0.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 18051e8ca2f4e154b701eb433ba4745ef1c9ed3cfdf0bcae24166fc0558092c3
[INFO] running `Command { std: "docker" "start" "-a" "18051e8ca2f4e154b701eb433ba4745ef1c9ed3cfdf0bcae24166fc0558092c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18051e8ca2f4e154b701eb433ba4745ef1c9ed3cfdf0bcae24166fc0558092c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18051e8ca2f4e154b701eb433ba4745ef1c9ed3cfdf0bcae24166fc0558092c3", kill_on_drop: false }`
[INFO] [stdout] 18051e8ca2f4e154b701eb433ba4745ef1c9ed3cfdf0bcae24166fc0558092c3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 574f1b68bcf3030e871fc0cc7c1aee02378239f275f8ccf1100ddee029587ca3
[INFO] running `Command { std: "docker" "start" "-a" "574f1b68bcf3030e871fc0cc7c1aee02378239f275f8ccf1100ddee029587ca3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.64
[INFO] [stderr]    Compiling libc v0.2.88
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling version_check v0.9.1
[INFO] [stderr]    Compiling futures-core v0.3.17
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]    Compiling arc-swap v0.4.5
[INFO] [stderr]    Compiling untrusted v0.7.0
[INFO] [stderr]    Compiling itoa v0.4.5
[INFO] [stderr]    Compiling futures-channel v0.3.17
[INFO] [stderr]    Compiling futures-sink v0.3.17
[INFO] [stderr]    Compiling futures-task v0.3.17
[INFO] [stderr]    Compiling proc-macro-nested v0.1.4
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling futures-io v0.3.17
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling bytes v0.5.4
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling try-lock v0.2.2
[INFO] [stderr]    Compiling tower-service v0.3.0
[INFO] [stderr]    Compiling ryu v1.0.3
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling pin-project-internal v0.4.26
[INFO] [stderr]    Compiling serde_json v1.0.67
[INFO] [stderr]    Compiling cpufeatures v0.1.4
[INFO] [stderr]    Compiling adler32 v1.0.4
[INFO] [stderr]    Compiling unicode-width v0.1.7
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling anyhow v1.0.43
[INFO] [stderr]    Compiling vec_map v0.8.1
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling pinyin v0.8.0
[INFO] [stderr]    Compiling async-trait v0.1.51
[INFO] [stderr]    Compiling unicode-normalization v0.1.12
[INFO] [stderr]    Compiling type-map v0.5.0
[INFO] [stderr]    Compiling aho-corasick v0.7.10
[INFO] [stderr]    Compiling quick-xml v0.20.0
[INFO] [stderr]    Compiling miniz_oxide v0.3.6
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling http v0.2.0
[INFO] [stderr]    Compiling ring v0.16.11
[INFO] [stderr]    Compiling idna v0.2.0
[INFO] [stderr]    Compiling tokio v1.11.0
[INFO] [stderr]    Compiling futures-macro v0.3.17
[INFO] [stderr]    Compiling futures-util v0.3.17
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]    Compiling regex v1.4.6
[INFO] [stderr]    Compiling want v0.3.0
[INFO] [stderr]    Compiling parking_lot_core v0.8.2
[INFO] [stderr]    Compiling mio v0.7.13
[INFO] [stderr]    Compiling num_cpus v1.12.0
[INFO] [stderr]    Compiling signal-hook-registry v1.2.0
[INFO] [stderr]    Compiling socket2 v0.3.19
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling nix v0.20.0
[INFO] [stderr]    Compiling flate2 v1.0.14
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling url v2.2.0
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling sct v0.6.0
[INFO] [stderr]    Compiling webpki v0.21.2
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling http-body v0.4.3
[INFO] [stderr]    Compiling headers-core v0.2.0
[INFO] [stderr]    Compiling sha-1 v0.9.6
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling headers v0.3.4
[INFO] [stderr]    Compiling webpki-roots v0.21.1
[INFO] [stderr]    Compiling rustls v0.19.1
[INFO] [stderr]    Compiling ct-logs v0.8.0
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling tempfile v3.2.0
[INFO] [stderr]    Compiling atomicwrites v0.3.0
[INFO] [stderr]    Compiling rustls-native-certs v0.5.0
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling pmutil v0.5.3
[INFO] [stderr]    Compiling tokio-macros v1.3.0
[INFO] [stderr]    Compiling tracing-attributes v0.1.13
[INFO] [stderr]    Compiling pin-project-internal v1.0.8
[INFO] [stderr]    Compiling thiserror-impl v1.0.29
[INFO] [stderr]    Compiling is-macro v0.1.9
[INFO] [stderr]    Compiling structopt-derive v0.4.16
[INFO] [stderr]    Compiling tracing v0.1.25
[INFO] [stderr]    Compiling thiserror v1.0.29
[INFO] [stderr]    Compiling pin-project v0.4.26
[INFO] [stderr]    Compiling pin-project v1.0.8
[INFO] [stderr]    Compiling tracing-futures v0.2.3
[INFO] [stderr]    Compiling structopt v0.3.23
[INFO] [stderr]    Compiling futures-executor v0.3.17
[INFO] [stderr]    Compiling futures v0.3.17
[INFO] [stderr]    Compiling tokio-util v0.6.8
[INFO] [stderr]    Compiling tokio-rustls v0.22.0
[INFO] [stderr]    Compiling async-socks5 v0.5.0
[INFO] [stderr]    Compiling async-compression v0.3.7
[INFO] [stderr]    Compiling tokio-stream v0.1.7
[INFO] [stderr]    Compiling h2 v0.3.4
[INFO] [stderr]    Compiling toml v0.5.6
[INFO] [stderr]    Compiling serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling hyper v0.14.4
[INFO] [stderr]    Compiling ctl10n v0.2.0
[INFO] [stderr]    Compiling rssbot v2.0.0-alpha.10 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling hyper-rustls v0.22.1
[INFO] [stderr]    Compiling hyper-proxy v0.9.1
[INFO] [stderr]    Compiling hyper-socks2 v0.6.0
[INFO] [stderr]    Compiling reqwest v0.11.4
[INFO] [stderr]    Compiling tbot v0.6.7 (https://gitlab.com/SnejUgal/tbot.git#6af54698)
[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(backtrace)]
[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 `rssbot` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "574f1b68bcf3030e871fc0cc7c1aee02378239f275f8ccf1100ddee029587ca3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "574f1b68bcf3030e871fc0cc7c1aee02378239f275f8ccf1100ddee029587ca3", kill_on_drop: false }`
[INFO] [stdout] 574f1b68bcf3030e871fc0cc7c1aee02378239f275f8ccf1100ddee029587ca3