[INFO] fetching crate ndless 0.8.8...
[INFO] testing ndless-0.8.8 against 1.90.0 for beta-1.91-3
[INFO] extracting crate ndless 0.8.8 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate ndless 0.8.8
[INFO] finished tweaking crates.io crate ndless 0.8.8
[INFO] tweaked toml for crates.io crate ndless 0.8.8 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ndless 0.8.8 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 13 packages to latest compatible versions
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded ndless-static-vars v2.1.0
[INFO] [stderr]   Downloaded cty v0.1.5
[INFO] [stderr]   Downloaded cstr_core v0.1.2
[INFO] [stderr]   Downloaded ndless-macros v0.4.0
[INFO] [stderr]   Downloaded ndless-sys v0.2.0
[INFO] [stderr]   Downloaded embedded-ffi v0.1.2
[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] 5161d14168bfa31525920f014a97f0a7fc3233d0c8d3d7331618febad875d2cf
[INFO] running `Command { std: "docker" "start" "-a" "5161d14168bfa31525920f014a97f0a7fc3233d0c8d3d7331618febad875d2cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5161d14168bfa31525920f014a97f0a7fc3233d0c8d3d7331618febad875d2cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5161d14168bfa31525920f014a97f0a7fc3233d0c8d3d7331618febad875d2cf", kill_on_drop: false }`
[INFO] [stdout] 5161d14168bfa31525920f014a97f0a7fc3233d0c8d3d7331618febad875d2cf
[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] c482c7130cf1def341a56ebaf65e43aa83c66ca044688c04ec543c7c8b1837f7
[INFO] running `Command { std: "docker" "start" "-a" "c482c7130cf1def341a56ebaf65e43aa83c66ca044688c04ec543c7c8b1837f7", kill_on_drop: false }`
[INFO] [stderr]    Compiling cty v0.2.2
[INFO] [stderr]    Compiling memchr v2.7.6
[INFO] [stderr]    Compiling cty v0.1.5
[INFO] [stderr]    Compiling ndless-static-vars v2.1.0
[INFO] [stderr]    Compiling ndless-sys v0.2.0
[INFO] [stderr]    Compiling ndless-macros v0.4.0
[INFO] [stderr]    Compiling cstr_core v0.1.2
[INFO] [stderr]    Compiling cstr_core v0.2.6
[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/cstr_core-0.1.2/src/lib.rs:12:32
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![cfg_attr(feature = "alloc", feature(alloc))]
[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 `cstr_core` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "c482c7130cf1def341a56ebaf65e43aa83c66ca044688c04ec543c7c8b1837f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c482c7130cf1def341a56ebaf65e43aa83c66ca044688c04ec543c7c8b1837f7", kill_on_drop: false }`
[INFO] [stdout] c482c7130cf1def341a56ebaf65e43aa83c66ca044688c04ec543c7c8b1837f7