[INFO] fetching crate panic-serial 0.1.2...
[INFO] testing panic-serial-0.1.2 against 1.90.0 for beta-1.91-3
[INFO] extracting crate panic-serial 0.1.2 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate panic-serial 0.1.2
[INFO] finished tweaking crates.io crate panic-serial 0.1.2
[INFO] tweaked toml for crates.io crate panic-serial 0.1.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate panic-serial 0.1.2 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 7 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ufmt-macros v0.3.0
[INFO] [stderr]   Downloaded ufmt-write v0.1.0
[INFO] [stderr]   Downloaded ufmt v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] f4c0406e98ba301b940567cfc14c7c6b5dfe89a86aacf1825d82a0d6bb82421d
[INFO] running `Command { std: "docker" "start" "-a" "f4c0406e98ba301b940567cfc14c7c6b5dfe89a86aacf1825d82a0d6bb82421d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f4c0406e98ba301b940567cfc14c7c6b5dfe89a86aacf1825d82a0d6bb82421d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4c0406e98ba301b940567cfc14c7c6b5dfe89a86aacf1825d82a0d6bb82421d", kill_on_drop: false }`
[INFO] [stdout] f4c0406e98ba301b940567cfc14c7c6b5dfe89a86aacf1825d82a0d6bb82421d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 7402bad1b068d483a02074798366ad38b1867e53d6fa5f70d8752566b932e1ef
[INFO] running `Command { std: "docker" "start" "-a" "7402bad1b068d483a02074798366ad38b1867e53d6fa5f70d8752566b932e1ef", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling ufmt-write v0.1.0
[INFO] [stderr]    Compiling quote v1.0.41
[INFO] [stderr]    Compiling ufmt-macros v0.3.0
[INFO] [stderr]    Compiling ufmt v0.2.0
[INFO] [stderr]    Compiling panic-serial 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:97:1
[INFO] [stdout]    |
[INFO] [stdout] 97 | #![feature(panic_info_message)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `panic_info_message` has been stable since 1.81.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/lib.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 97 | #![feature(panic_info_message)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:124:16
[INFO] [stdout]     |
[INFO] [stdout] 124 |         if let Some(message) = info.message() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^   -------------- this expression has type `PanicMessage<'_>`
[INFO] [stdout]     |                |
[INFO] [stdout]     |                expected `PanicMessage<'_>`, found `Option<_>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected struct `PanicMessage<'_>`
[INFO] [stdout]                  found enum `Option<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `panic-serial` (lib) due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "7402bad1b068d483a02074798366ad38b1867e53d6fa5f70d8752566b932e1ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7402bad1b068d483a02074798366ad38b1867e53d6fa5f70d8752566b932e1ef", kill_on_drop: false }`
[INFO] [stdout] 7402bad1b068d483a02074798366ad38b1867e53d6fa5f70d8752566b932e1ef
