[INFO] fetching crate namaste 0.29.3...
[INFO] building namaste-0.29.3 against 1.90.0 for beta-1.91-3
[INFO] extracting crate namaste 0.29.3 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate namaste 0.29.3
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate namaste 0.29.3
[INFO] tweaked toml for crates.io crate namaste 0.29.3 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate namaste 0.29.3 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 namaste 0.29.3 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 async-io v2.4.1
[INFO] [stderr]   Downloaded async-channel v2.4.0
[INFO] [stderr]   Downloaded blackhole v0.20.2
[INFO] [stderr]   Downloaded dia-time v9.0.0
[INFO] [stderr]   Downloaded dia-args v0.61.0
[INFO] [stderr]   Downloaded cld v0.5.1
[INFO] [stderr]   Downloaded async-std v1.13.1
[INFO] [stderr]   Downloaded zeros v17.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 43722f6ed7ba78dfcb45b0c1e9e48d3fd0710b7ba511fe3db90dfdf8b8827caf
[INFO] running `Command { std: "docker" "start" "-a" "43722f6ed7ba78dfcb45b0c1e9e48d3fd0710b7ba511fe3db90dfdf8b8827caf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43722f6ed7ba78dfcb45b0c1e9e48d3fd0710b7ba511fe3db90dfdf8b8827caf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43722f6ed7ba78dfcb45b0c1e9e48d3fd0710b7ba511fe3db90dfdf8b8827caf", kill_on_drop: false }`
[INFO] [stdout] 43722f6ed7ba78dfcb45b0c1e9e48d3fd0710b7ba511fe3db90dfdf8b8827caf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 2cab08a1598a8da615f196e87ec11d3b4b2d5e21453e581c0ba6e22e14573047
[INFO] running `Command { std: "docker" "start" "-a" "2cab08a1598a8da615f196e87ec11d3b4b2d5e21453e581c0ba6e22e14573047", kill_on_drop: false }`
[INFO] [stderr]    Compiling namaste v0.29.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:64:1
[INFO] [stdout]    |
[INFO] [stdout] 64 | #![feature(doc_cfg)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:65:76
[INFO] [stdout]    |
[INFO] [stdout] 65 | #![cfg_attr(any(target_os="linux", target_os="l4re", target_os="android"), feature(btree_extract_if))]
[INFO] [stdout]    |                                                                            ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:66:35
[INFO] [stdout]    |
[INFO] [stdout] 66 | #![cfg_attr(target_family="unix", feature(unix_socket_ancillary_data))]
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `namaste` (lib) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "2cab08a1598a8da615f196e87ec11d3b4b2d5e21453e581c0ba6e22e14573047", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2cab08a1598a8da615f196e87ec11d3b4b2d5e21453e581c0ba6e22e14573047", kill_on_drop: false }`
[INFO] [stdout] 2cab08a1598a8da615f196e87ec11d3b4b2d5e21453e581c0ba6e22e14573047