[INFO] fetching crate csv_challenge_ex 0.1.0...
[INFO] checking csv_challenge_ex-0.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate csv_challenge_ex 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate csv_challenge_ex 0.1.0
[INFO] finished tweaking crates.io crate csv_challenge_ex 0.1.0
[INFO] tweaked toml for crates.io crate csv_challenge_ex 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate csv_challenge_ex 0.1.0 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 csv_challenge_ex 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] ce0709d5b4e54f5e779f3187f8cfe800b41afb04594135651754ab2377c935d0
[INFO] running `Command { std: "docker" "start" "-a" "ce0709d5b4e54f5e779f3187f8cfe800b41afb04594135651754ab2377c935d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce0709d5b4e54f5e779f3187f8cfe800b41afb04594135651754ab2377c935d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce0709d5b4e54f5e779f3187f8cfe800b41afb04594135651754ab2377c935d0", kill_on_drop: false }`
[INFO] [stdout] ce0709d5b4e54f5e779f3187f8cfe800b41afb04594135651754ab2377c935d0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 847ff00f2e825ae74cc48b7f4fda2427d25eae3543a21eda37e34abe5bd0d59e
[INFO] running `Command { std: "docker" "start" "-a" "847ff00f2e825ae74cc48b7f4fda2427d25eae3543a21eda37e34abe5bd0d59e", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling structopt-derive v0.4.10
[INFO] [stderr]     Checking structopt v0.3.17
[INFO] [stderr]     Checking csv_challenge_ex v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> src/opt.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | /     #[structopt(help = "Input File")]
[INFO] [stdout] 6 | |     pub input: 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<String, Infallible>
[INFO] [stdout]  --> src/opt.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     #[structopt(help = "Column Name")]
[INFO] [stdout] 8 | |     pub column_name: String,
[INFO] [stdout]   | |___________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/opt.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | /     #[structopt(help = "Replacement  Column Name")]
[INFO] [stdout] 10 | |     pub replacement: String,
[INFO] [stdout]    | |___________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/opt.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | /     #[structopt(help = "Output file. stdout if not present")]
[INFO] [stdout] 12 | |     pub output: Option<String>,
[INFO] [stdout]    | |______________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> src/opt.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | /     #[structopt(help = "Input File")]
[INFO] [stdout] 6 | |     pub input: 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<String, Infallible>
[INFO] [stdout]  --> src/opt.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     #[structopt(help = "Column Name")]
[INFO] [stdout] 8 | |     pub column_name: String,
[INFO] [stdout]   | |___________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/opt.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | /     #[structopt(help = "Replacement  Column Name")]
[INFO] [stdout] 10 | |     pub replacement: String,
[INFO] [stdout]    | |___________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/opt.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | /     #[structopt(help = "Output file. stdout if not present")]
[INFO] [stdout] 12 | |     pub output: Option<String>,
[INFO] [stdout]    | |______________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `csv_challenge_ex` (lib) due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `csv_challenge_ex` (lib test) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "847ff00f2e825ae74cc48b7f4fda2427d25eae3543a21eda37e34abe5bd0d59e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "847ff00f2e825ae74cc48b7f4fda2427d25eae3543a21eda37e34abe5bd0d59e", kill_on_drop: false }`
[INFO] [stdout] 847ff00f2e825ae74cc48b7f4fda2427d25eae3543a21eda37e34abe5bd0d59e