[INFO] fetching crate async-circe 0.2.3...
[INFO] testing async-circe-0.2.3 against 1.60.0 for beta-1.61-1
[INFO] extracting crate async-circe 0.2.3 into /workspace/builds/worker-81/source
[INFO] validating manifest of crates.io crate async-circe 0.2.3 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate async-circe 0.2.3
[INFO] finished tweaking crates.io crate async-circe 0.2.3
[INFO] tweaked toml for crates.io crate async-circe 0.2.3 written to /workspace/builds/worker-81/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3dd5e209efbfbe869c0c644dbd8c9d5524646189b7ce24687a7dfc479e6e4447
[INFO] running `Command { std: "docker" "start" "-a" "3dd5e209efbfbe869c0c644dbd8c9d5524646189b7ce24687a7dfc479e6e4447", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3dd5e209efbfbe869c0c644dbd8c9d5524646189b7ce24687a7dfc479e6e4447", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3dd5e209efbfbe869c0c644dbd8c9d5524646189b7ce24687a7dfc479e6e4447", kill_on_drop: false }`
[INFO] [stdout] 3dd5e209efbfbe869c0c644dbd8c9d5524646189b7ce24687a7dfc479e6e4447
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ce48b568ee034904a97f02069795ef21c72acfc66a053202341be6d922683e79
[INFO] running `Command { std: "docker" "start" "-a" "ce48b568ee034904a97f02069795ef21c72acfc66a053202341be6d922683e79", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]    Compiling pkg-config v0.3.25
[INFO] [stderr]    Compiling log v0.4.16
[INFO] [stderr]    Compiling foreign-types-shared v0.1.1
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling openssl v0.10.38
[INFO] [stderr]    Compiling native-tls v0.2.10
[INFO] [stderr]    Compiling openssl-probe v0.1.5
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]    Compiling tracing-core v0.1.25
[INFO] [stderr]    Compiling foreign-types v0.3.2
[INFO] [stderr]    Compiling mio v0.8.2
[INFO] [stderr]    Compiling tokio v1.17.0
[INFO] [stderr]    Compiling openssl-sys v0.9.72
[INFO] [stderr]    Compiling tokio-native-tls v0.3.0
[INFO] [stderr]    Compiling tracing-attributes v0.1.20
[INFO] [stderr]    Compiling tracing v0.1.33
[INFO] [stderr]    Compiling async-circe v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:28:1
[INFO] [stdout]    |
[INFO] [stdout] 28 | #![feature(doc_cfg)]
[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 `async-circe` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ce48b568ee034904a97f02069795ef21c72acfc66a053202341be6d922683e79", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce48b568ee034904a97f02069795ef21c72acfc66a053202341be6d922683e79", kill_on_drop: false }`
[INFO] [stdout] ce48b568ee034904a97f02069795ef21c72acfc66a053202341be6d922683e79