[INFO] fetching crate io-read-line-prototype 1.0.1...
[INFO] checking io-read-line-prototype-1.0.1 against 1.95.0 for pr-155915
[INFO] extracting crate io-read-line-prototype 1.0.1 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate io-read-line-prototype 1.0.1
[INFO] finished tweaking crates.io crate io-read-line-prototype 1.0.1
[INFO] tweaked toml for crates.io crate io-read-line-prototype 1.0.1 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate io-read-line-prototype 1.0.1 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "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" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3f7178eb48c3aac4fbc2c6376c8a900125aa6dafe85fc328bf694a1164ecd791
[INFO] running `Command { std: "docker" "start" "-a" "3f7178eb48c3aac4fbc2c6376c8a900125aa6dafe85fc328bf694a1164ecd791", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3f7178eb48c3aac4fbc2c6376c8a900125aa6dafe85fc328bf694a1164ecd791", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f7178eb48c3aac4fbc2c6376c8a900125aa6dafe85fc328bf694a1164ecd791", kill_on_drop: false }`
[INFO] [stdout] 3f7178eb48c3aac4fbc2c6376c8a900125aa6dafe85fc328bf694a1164ecd791
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 88be6086c87c03ed9e66101b9597684f1f33f30b39a0b70c06d9f93d517e2957
[INFO] running `Command { std: "docker" "start" "-a" "88be6086c87c03ed9e66101b9597684f1f33f30b39a0b70c06d9f93d517e2957", kill_on_drop: false }`
[INFO] [stderr]     Checking io-read-line-prototype v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | #![feature(min_specialization)]
[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 `io-read-line-prototype` (lib) due to 1 previous error
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | #![feature(min_specialization)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `io-read-line-prototype` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "88be6086c87c03ed9e66101b9597684f1f33f30b39a0b70c06d9f93d517e2957", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88be6086c87c03ed9e66101b9597684f1f33f30b39a0b70c06d9f93d517e2957", kill_on_drop: false }`
[INFO] [stdout] 88be6086c87c03ed9e66101b9597684f1f33f30b39a0b70c06d9f93d517e2957
