[INFO] cloning repository https://github.com/gregtatum/rust-sketches
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gregtatum/rust-sketches" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgregtatum%2Frust-sketches", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgregtatum%2Frust-sketches'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dfc6fa8b7f5df49bdf9ca68b8c2f40767a209075
[INFO] testing gregtatum/rust-sketches against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgregtatum%2Frust-sketches" "/workspace/builds/worker-76/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-76/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gregtatum/rust-sketches 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/gregtatum/rust-sketches
[INFO] finished tweaking git repo https://github.com/gregtatum/rust-sketches
[INFO] tweaked toml for git repo https://github.com/gregtatum/rust-sketches written to /workspace/builds/worker-76/source/Cargo.toml
[INFO] crate git repo https://github.com/gregtatum/rust-sketches 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]  Downloading crates ...
[INFO] [stderr]   Downloaded erased-serde v0.3.12
[INFO] [stderr]   Downloaded icu_locid v0.1.0
[INFO] [stderr]   Downloaded icu_plurals v0.1.0
[INFO] [stderr]   Downloaded icu_datetime v0.1.0
[INFO] [stderr]   Downloaded icu_provider v0.1.0
[INFO] [stderr]   Downloaded smallstr v0.2.0
[INFO] [stderr]   Downloaded syn v1.0.54
[INFO] [stderr]   Downloaded icu v0.1.0
[INFO] [stderr]   Downloaded icu_locid_macros v0.1.0
[INFO] [stderr]   Downloaded tinystr-raw v0.1.0
[INFO] [stderr]   Downloaded icu_provider_fs v0.1.0
[INFO] [stderr]   Downloaded icu_uniset v0.1.0
[INFO] [stderr]   Downloaded fixed_decimal v0.1.0
[INFO] [stderr]   Downloaded tinystr v0.4.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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] 140d6e720d9c207fbc60472dfc05694866b2472293002749b1bce21ae5e0c9a5
[INFO] running `Command { std: "docker" "start" "-a" "140d6e720d9c207fbc60472dfc05694866b2472293002749b1bce21ae5e0c9a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "140d6e720d9c207fbc60472dfc05694866b2472293002749b1bce21ae5e0c9a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "140d6e720d9c207fbc60472dfc05694866b2472293002749b1bce21ae5e0c9a5", kill_on_drop: false }`
[INFO] [stdout] 140d6e720d9c207fbc60472dfc05694866b2472293002749b1bce21ae5e0c9a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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] 33550ebd9c8344e347f7e4df04097e6e9d6f2c106e55d584c0abcd3c0bef082b
[INFO] running `Command { std: "docker" "start" "-a" "33550ebd9c8344e347f7e4df04097e6e9d6f2c106e55d584c0abcd3c0bef082b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling tinystr-raw v0.1.0
[INFO] [stderr]    Compiling smallvec v1.5.1
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling serde_json v1.0.60
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling libc v0.2.21
[INFO] [stderr]    Compiling icu_uniset v0.1.0
[INFO] [stderr]    Compiling tinystr-macros v0.2.0
[INFO] [stderr]    Compiling fixed_decimal v0.1.0
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling tinystr v0.4.1
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling icu_locid v0.1.0
[INFO] [stderr]    Compiling erased-serde v0.3.12
[INFO] [stderr]    Compiling smallstr v0.2.0
[INFO] [stderr]    Compiling toml v0.5.7
[INFO] [stderr]    Compiling icu_provider v0.1.0
[INFO] [stderr]    Compiling proc-macro-crate v0.1.5
[INFO] [stderr]    Compiling icu_locid_macros v0.1.0
[INFO] [stderr]    Compiling icu_datetime v0.1.0
[INFO] [stderr]    Compiling icu_plurals v0.1.0
[INFO] [stderr]    Compiling icu_provider_fs v0.1.0
[INFO] [stderr]    Compiling icu v0.1.0
[INFO] [stderr]    Compiling spec-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(test)]
[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 `spec-rs` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "33550ebd9c8344e347f7e4df04097e6e9d6f2c106e55d584c0abcd3c0bef082b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33550ebd9c8344e347f7e4df04097e6e9d6f2c106e55d584c0abcd3c0bef082b", kill_on_drop: false }`
[INFO] [stdout] 33550ebd9c8344e347f7e4df04097e6e9d6f2c106e55d584c0abcd3c0bef082b