[INFO] fetching crate cowbird 0.1.1...
[INFO] checking cowbird-0.1.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate cowbird 0.1.1 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate cowbird 0.1.1
[INFO] finished tweaking crates.io crate cowbird 0.1.1
[INFO] tweaked toml for crates.io crate cowbird 0.1.1 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate cowbird 0.1.1 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate cowbird 0.1.1 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0b498412f13e262c3becf85c3a3c794e2f322c8a9a1beb1abb3595b1e88e9e18
[INFO] running `Command { std: "docker" "start" "-a" "0b498412f13e262c3becf85c3a3c794e2f322c8a9a1beb1abb3595b1e88e9e18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b498412f13e262c3becf85c3a3c794e2f322c8a9a1beb1abb3595b1e88e9e18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b498412f13e262c3becf85c3a3c794e2f322c8a9a1beb1abb3595b1e88e9e18", kill_on_drop: false }`
[INFO] [stdout] 0b498412f13e262c3becf85c3a3c794e2f322c8a9a1beb1abb3595b1e88e9e18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 54377ff3e69da9d20e56f2dbcd41698ba43b70904a1bc589e0917fe52c08494c
[INFO] running `Command { std: "docker" "start" "-a" "54377ff3e69da9d20e56f2dbcd41698ba43b70904a1bc589e0917fe52c08494c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling libc v0.2.115
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling crossbeam-utils v0.8.6
[INFO] [stderr]    Compiling indexmap v1.8.0
[INFO] [stderr]     Checking once_cell v1.9.0
[INFO] [stderr]    Compiling serde_json v1.0.78
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]     Checking arc-swap v1.5.0
[INFO] [stderr]    Compiling slog-async v2.7.0
[INFO] [stderr]    Compiling substring v1.4.5
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]     Checking thread_local v1.1.4
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]     Checking take_mut v0.2.2
[INFO] [stderr]     Checking byteorder v0.5.3
[INFO] [stderr]     Checking textwrap v0.14.2
[INFO] [stderr]     Checking strsim v0.10.0
[INFO] [stderr]     Checking fastrand v1.7.0
[INFO] [stderr]     Checking whoami v1.2.1
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking crossbeam-channel v0.5.2
[INFO] [stderr]     Checking slog-scope v4.4.0
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking os_str_bytes v6.0.0
[INFO] [stderr]     Checking slog-stdlog v4.1.0
[INFO] [stderr]    Compiling quote v1.0.15
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking dirs-sys-next v0.1.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking stdio-override v0.1.3
[INFO] [stderr]     Checking tempfile v3.3.0
[INFO] [stderr]     Checking positioned-io v0.2.2
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking dirs-next v2.0.0
[INFO] [stderr]     Checking term v0.7.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking slog-term v2.8.0
[INFO] [stderr]     Checking slog-envlogger v2.2.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling clap_derive v3.0.12
[INFO] [stderr]     Checking thiserror v1.0.30
[INFO] [stderr]     Checking yaml-split v0.3.2
[INFO] [stderr]     Checking clap v3.0.13
[INFO] [stderr]     Checking serde_yaml v0.8.23
[INFO] [stderr]     Checking slog-json v2.5.0
[INFO] [stderr]     Checking cowbird v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | /     /// Log file location
[INFO] [stdout] 15 | |     #[clap(short, long, default_value_t = concat!(env!["CARGO_PKG_NAME"],".log").to_string())]
[INFO] [stdout] 16 | |     pub log: String,
[INFO] [stdout]    | |___________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         exec: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | /         #[serde(default)]
[INFO] [stdout] 18 | |         args: Vec<String>,
[INFO] [stdout]    | |_________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | /         /// File to create
[INFO] [stdout] 23 | |         file: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | /         /// File to modify
[INFO] [stdout] 28 | |         file: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 | /         /// Bytes to write, decode hex if value starts with "0x"
[INFO] [stdout] 30 | |         data: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 | /         /// File to delete
[INFO] [stdout] 39 | |         file: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 | /         /// Bytes to write, decode hex if value starts with "0x"
[INFO] [stdout] 46 | |         #[clap(default_value = "")]
[INFO] [stdout] 47 | |         #[serde(default)]
[INFO] [stdout] 48 | |         data: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 | /         /// File to read
[INFO] [stdout] 57 | |         #[clap(default_value = "-")]
[INFO] [stdout] 58 | |         file: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cowbird` (lib test) due to 9 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | /     /// Log file location
[INFO] [stdout] 15 | |     #[clap(short, long, default_value_t = concat!(env!["CARGO_PKG_NAME"],".log").to_string())]
[INFO] [stdout] 16 | |     pub log: String,
[INFO] [stdout]    | |___________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         exec: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | /         #[serde(default)]
[INFO] [stdout] 18 | |         args: Vec<String>,
[INFO] [stdout]    | |_________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | /         /// File to create
[INFO] [stdout] 23 | |         file: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | /         /// File to modify
[INFO] [stdout] 28 | |         file: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 | /         /// Bytes to write, decode hex if value starts with "0x"
[INFO] [stdout] 30 | |         data: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 | /         /// File to delete
[INFO] [stdout] 39 | |         file: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 | /         /// Bytes to write, decode hex if value starts with "0x"
[INFO] [stdout] 46 | |         #[clap(default_value = "")]
[INFO] [stdout] 47 | |         #[serde(default)]
[INFO] [stdout] 48 | |         data: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cmd.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 | /         /// File to read
[INFO] [stdout] 57 | |         #[clap(default_value = "-")]
[INFO] [stdout] 58 | |         file: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cowbird` (lib) due to 9 previous errors
[INFO] running `Command { std: "docker" "inspect" "54377ff3e69da9d20e56f2dbcd41698ba43b70904a1bc589e0917fe52c08494c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54377ff3e69da9d20e56f2dbcd41698ba43b70904a1bc589e0917fe52c08494c", kill_on_drop: false }`
[INFO] [stdout] 54377ff3e69da9d20e56f2dbcd41698ba43b70904a1bc589e0917fe52c08494c
