[INFO] fetching crate packed-vec 0.0.1-alpha.12...
[INFO] testing packed-vec-0.0.1-alpha.12 against 1.90.0 for beta-1.91-3
[INFO] extracting crate packed-vec 0.0.1-alpha.12 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate packed-vec 0.0.1-alpha.12
[INFO] finished tweaking crates.io crate packed-vec 0.0.1-alpha.12
[INFO] tweaked toml for crates.io crate packed-vec 0.0.1-alpha.12 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate packed-vec 0.0.1-alpha.12 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 15 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded prefix-varint v0.0.1-alpha.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] d2ae703de4fc7afdd41925448db0b10d183066a1095d48a9298ed78e39d11da1
[INFO] running `Command { std: "docker" "start" "-a" "d2ae703de4fc7afdd41925448db0b10d183066a1095d48a9298ed78e39d11da1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2ae703de4fc7afdd41925448db0b10d183066a1095d48a9298ed78e39d11da1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2ae703de4fc7afdd41925448db0b10d183066a1095d48a9298ed78e39d11da1", kill_on_drop: false }`
[INFO] [stdout] d2ae703de4fc7afdd41925448db0b10d183066a1095d48a9298ed78e39d11da1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 73a1f992abee6ecc791a15e10b79310ad3c48040b12d222e1aa09cfbd0f50d41
[INFO] running `Command { std: "docker" "start" "-a" "73a1f992abee6ecc791a15e10b79310ad3c48040b12d222e1aa09cfbd0f50d41", kill_on_drop: false }`
[INFO] [stderr]    Compiling prefix-varint v0.0.1-alpha.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/prefix-varint-0.0.1-alpha.6/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(cursor_remaining)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `cursor_remaining`
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/prefix-varint-0.0.1-alpha.6/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(cursor_remaining)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `prefix-varint` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "73a1f992abee6ecc791a15e10b79310ad3c48040b12d222e1aa09cfbd0f50d41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73a1f992abee6ecc791a15e10b79310ad3c48040b12d222e1aa09cfbd0f50d41", kill_on_drop: false }`
[INFO] [stdout] 73a1f992abee6ecc791a15e10b79310ad3c48040b12d222e1aa09cfbd0f50d41