[INFO] fetching crate hot_potato_proc_macro 0.1.2...
[INFO] testing hot_potato_proc_macro-0.1.2 against 1.75.0 for beta-1.76-1
[INFO] extracting crate hot_potato_proc_macro 0.1.2 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate hot_potato_proc_macro 0.1.2 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hot_potato_proc_macro 0.1.2
[INFO] finished tweaking crates.io crate hot_potato_proc_macro 0.1.2
[INFO] tweaked toml for crates.io crate hot_potato_proc_macro 0.1.2 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded venial v0.5.0
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e921c105a97ef044f82f9faa3fd82ec7fad1761a4ff07f4c966a4a13bb84b0bd
[INFO] running `Command { std: "docker" "start" "-a" "e921c105a97ef044f82f9faa3fd82ec7fad1761a4ff07f4c966a4a13bb84b0bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e921c105a97ef044f82f9faa3fd82ec7fad1761a4ff07f4c966a4a13bb84b0bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e921c105a97ef044f82f9faa3fd82ec7fad1761a4ff07f4c966a4a13bb84b0bd", kill_on_drop: false }`
[INFO] [stdout] e921c105a97ef044f82f9faa3fd82ec7fad1761a4ff07f4c966a4a13bb84b0bd
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 521407de946659542ec1df58af713c544fc4d5a13f0fe783443c952b8aa9cc98
[INFO] running `Command { std: "docker" "start" "-a" "521407de946659542ec1df58af713c544fc4d5a13f0fe783443c952b8aa9cc98", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling venial v0.5.0
[INFO] [stderr]    Compiling hot_potato_proc_macro v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_diagnostic)]
[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 `hot_potato_proc_macro` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "521407de946659542ec1df58af713c544fc4d5a13f0fe783443c952b8aa9cc98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "521407de946659542ec1df58af713c544fc4d5a13f0fe783443c952b8aa9cc98", kill_on_drop: false }`
[INFO] [stdout] 521407de946659542ec1df58af713c544fc4d5a13f0fe783443c952b8aa9cc98
