[INFO] fetching crate tupelo_guessing_game 0.1.0...
[INFO] testing tupelo_guessing_game-0.1.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate tupelo_guessing_game 0.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate tupelo_guessing_game 0.1.0
[INFO] finished tweaking crates.io crate tupelo_guessing_game 0.1.0
[INFO] tweaked toml for crates.io crate tupelo_guessing_game 0.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate tupelo_guessing_game 0.1.0 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate tupelo_guessing_game 0.1.0 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c8e8ef16d8c36d5981c59f44c406b879f4f33841228bc53ecb7b4d0403d671f8
[INFO] running `Command { std: "docker" "start" "-a" "c8e8ef16d8c36d5981c59f44c406b879f4f33841228bc53ecb7b4d0403d671f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c8e8ef16d8c36d5981c59f44c406b879f4f33841228bc53ecb7b4d0403d671f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8e8ef16d8c36d5981c59f44c406b879f4f33841228bc53ecb7b4d0403d671f8", kill_on_drop: false }`
[INFO] [stdout] c8e8ef16d8c36d5981c59f44c406b879f4f33841228bc53ecb7b4d0403d671f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 33f3738c5f6d2c5e73c4087078bc14ef15e5e5772c0fe9a1c0041d81c2b8363a
[INFO] running `Command { std: "docker" "start" "-a" "33f3738c5f6d2c5e73c4087078bc14ef15e5e5772c0fe9a1c0041d81c2b8363a", kill_on_drop: false }`
[INFO] [stderr]    Compiling tupelo_guessing_game v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(format_args_capture)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `format_args_capture` has been stable since `1.58.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `format_args_capture` has been stable since 1.58.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(format_args_capture)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tupelo_guessing_game` (bin "tupelo_guessing_game") due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "33f3738c5f6d2c5e73c4087078bc14ef15e5e5772c0fe9a1c0041d81c2b8363a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33f3738c5f6d2c5e73c4087078bc14ef15e5e5772c0fe9a1c0041d81c2b8363a", kill_on_drop: false }`
[INFO] [stdout] 33f3738c5f6d2c5e73c4087078bc14ef15e5e5772c0fe9a1c0041d81c2b8363a