[INFO] fetching crate fast_config 1.2.1...
[INFO] testing fast_config-1.2.1 against try#b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b for pr-145330-1
[INFO] extracting crate fast_config 1.2.1 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate fast_config 1.2.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate fast_config 1.2.1
[INFO] tweaked toml for crates.io crate fast_config 1.2.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate fast_config 1.2.1 on toolchain b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate fast_config 1.2.1 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" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 91f9616b2b1e3a9706e4bea9ade9efd934536b0f9ee70e44a9b05d3d10091e53
[INFO] running `Command { std: "docker" "start" "-a" "91f9616b2b1e3a9706e4bea9ade9efd934536b0f9ee70e44a9b05d3d10091e53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "91f9616b2b1e3a9706e4bea9ade9efd934536b0f9ee70e44a9b05d3d10091e53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91f9616b2b1e3a9706e4bea9ade9efd934536b0f9ee70e44a9b05d3d10091e53", kill_on_drop: false }`
[INFO] [stdout] 91f9616b2b1e3a9706e4bea9ade9efd934536b0f9ee70e44a9b05d3d10091e53
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef08d2437561f8ce74812659c5b818cd2bbf1f31fd3ded06c4b5b4a846442fa8
[INFO] running `Command { std: "docker" "start" "-a" "ef08d2437561f8ce74812659c5b818cd2bbf1f31fd3ded06c4b5b4a846442fa8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.89
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling thiserror v1.0.65
[INFO] [stderr]    Compiling serde v1.0.213
[INFO] [stderr]    Compiling log v0.4.22
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.85
[INFO] [stderr]    Compiling serde_derive v1.0.213
[INFO] [stderr]    Compiling thiserror-impl v1.0.65
[INFO] [stderr]    Compiling fast_config v1.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: You must install at least one format feature: `json`, `json5`, `toml`, or `yaml`
[INFO] [stdout]   --> src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | compile_error!("You must install at least one format feature: `json`, `json5`, `toml`, or `yaml`");
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/format_dependant.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let mut vector = Vec::new();
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/format_dependant.rs:41:21
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn to_string<D>(value: &D, options: &InternalOptions) -> GenericResult<String> where D: Serialize {
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/format_dependant.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let value = value.as_str();
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fast_config` (lib) due to 1 previous error; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "ef08d2437561f8ce74812659c5b818cd2bbf1f31fd3ded06c4b5b4a846442fa8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef08d2437561f8ce74812659c5b818cd2bbf1f31fd3ded06c4b5b4a846442fa8", kill_on_drop: false }`
[INFO] [stdout] ef08d2437561f8ce74812659c5b818cd2bbf1f31fd3ded06c4b5b4a846442fa8