[INFO] fetching crate couchdb-orm 0.1.6...
[INFO] testing couchdb-orm-0.1.6 against 1.90.0 for beta-1.91-3
[INFO] extracting crate couchdb-orm 0.1.6 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate couchdb-orm 0.1.6
[INFO] finished tweaking crates.io crate couchdb-orm 0.1.6
[INFO] tweaked toml for crates.io crate couchdb-orm 0.1.6 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate couchdb-orm 0.1.6 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate couchdb-orm 0.1.6 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded infer v0.2.3
[INFO] [stderr]   Downloaded futures-core v0.3.23
[INFO] [stderr]   Downloaded serde_qs v0.8.5
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[INFO] [stderr]   Downloaded android_system_properties v0.1.4
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[INFO] [stderr]   Downloaded cmd_lib_core v0.1.0
[INFO] [stderr]   Downloaded predicates-core v1.0.3
[INFO] [stderr]   Downloaded paw-attributes v1.0.2
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[INFO] [stderr]   Downloaded futures-executor v0.3.23
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 99476a4dfd7b0ee6b75778f9ab0eb53eb22de28cc6294f1c0abf4083576229d2
[INFO] running `Command { std: "docker" "start" "-a" "99476a4dfd7b0ee6b75778f9ab0eb53eb22de28cc6294f1c0abf4083576229d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "99476a4dfd7b0ee6b75778f9ab0eb53eb22de28cc6294f1c0abf4083576229d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99476a4dfd7b0ee6b75778f9ab0eb53eb22de28cc6294f1c0abf4083576229d2", kill_on_drop: false }`
[INFO] [stdout] 99476a4dfd7b0ee6b75778f9ab0eb53eb22de28cc6294f1c0abf4083576229d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8d555a3cb49ad876dc6e0fb631b3fcd4ead45edb64a89f92da9346810707233d
[INFO] running `Command { std: "docker" "start" "-a" "8d555a3cb49ad876dc6e0fb631b3fcd4ead45edb64a89f92da9346810707233d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling futures-core v0.3.23
[INFO] [stderr]    Compiling futures-sink v0.3.23
[INFO] [stderr]    Compiling futures-channel v0.3.23
[INFO] [stderr]    Compiling futures-task v0.3.23
[INFO] [stderr]    Compiling futures-util v0.3.23
[INFO] [stderr]    Compiling futures-io v0.3.23
[INFO] [stderr]    Compiling pin-project-lite v0.1.12
[INFO] [stderr]    Compiling lock_api v0.4.8
[INFO] [stderr]    Compiling pin-project-internal v0.4.30
[INFO] [stderr]    Compiling standback v0.2.17
[INFO] [stderr]    Compiling once_cell v1.13.1
[INFO] [stderr]    Compiling form_urlencoded v1.0.1
[INFO] [stderr]    Compiling unicode-normalization v0.1.21
[INFO] [stderr]    Compiling generic-array v0.14.6
[INFO] [stderr]    Compiling async-trait v0.1.57
[INFO] [stderr]    Compiling match_cfg v0.1.0
[INFO] [stderr]    Compiling const_fn v0.4.9
[INFO] [stderr]    Compiling time v0.2.27
[INFO] [stderr]    Compiling tracing-core v0.1.29
[INFO] [stderr]    Compiling copyless v0.1.5
[INFO] [stderr]    Compiling alloc-no-stdlib v2.0.3
[INFO] [stderr]    Compiling unicode-width v0.1.9
[INFO] [stderr]    Compiling lru-cache v0.1.2
[INFO] [stderr]    Compiling cookie v0.14.4
[INFO] [stderr]    Compiling alloc-stdlib v0.2.1
[INFO] [stderr]    Compiling idna v0.2.3
[INFO] [stderr]    Compiling httparse v1.7.1
[INFO] [stderr]    Compiling miniz_oxide v0.5.3
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling cpufeatures v0.2.4
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling brotli-decompressor v2.3.2
[INFO] [stderr]    Compiling paw-raw v1.0.0
[INFO] [stderr]    Compiling fastrand v1.8.0
[INFO] [stderr]    Compiling cmd_lib_core v0.1.0
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling tracing v0.1.36
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling language-tags v0.2.2
[INFO] [stderr]    Compiling iana-time-zone v0.1.46
[INFO] [stderr]    Compiling sha-1 v0.9.8
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling zeroize v1.5.7
[INFO] [stderr]    Compiling regex v1.6.0
[INFO] [stderr]    Compiling flate2 v1.0.24
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling url v2.2.2
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling net2 v0.2.37
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling num_cpus v1.13.1
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]    Compiling hostname v0.3.1
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling terminal_size v0.1.17
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling threadpool v1.8.1
[INFO] [stderr]    Compiling resolv-conf v0.7.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling cmd_lib_macros v0.1.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/cmd_lib_macros-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_span)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr] error: could not compile `cmd_lib_macros` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "8d555a3cb49ad876dc6e0fb631b3fcd4ead45edb64a89f92da9346810707233d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d555a3cb49ad876dc6e0fb631b3fcd4ead45edb64a89f92da9346810707233d", kill_on_drop: false }`
[INFO] [stdout] 8d555a3cb49ad876dc6e0fb631b3fcd4ead45edb64a89f92da9346810707233d