[INFO] fetching crate slb 0.3.1...
[INFO] checking slb-0.3.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate slb 0.3.1 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate slb 0.3.1
[INFO] finished tweaking crates.io crate slb 0.3.1
[INFO] tweaked toml for crates.io crate slb 0.3.1 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate slb 0.3.1 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 slb 0.3.1 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 2d8b0ee3c597426f2504aba25751f8b199b7f5a42a65d17b445f2eb20dc3e6fb
[INFO] running `Command { std: "docker" "start" "-a" "2d8b0ee3c597426f2504aba25751f8b199b7f5a42a65d17b445f2eb20dc3e6fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d8b0ee3c597426f2504aba25751f8b199b7f5a42a65d17b445f2eb20dc3e6fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d8b0ee3c597426f2504aba25751f8b199b7f5a42a65d17b445f2eb20dc3e6fb", kill_on_drop: false }`
[INFO] [stdout] 2d8b0ee3c597426f2504aba25751f8b199b7f5a42a65d17b445f2eb20dc3e6fb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] da850c9a751f8aebd7011d20b3e4e9fac6e31c3578b8c2d20db14248cce4391c
[INFO] running `Command { std: "docker" "start" "-a" "da850c9a751f8aebd7011d20b3e4e9fac6e31c3578b8c2d20db14248cce4391c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking bstr v0.2.16
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling structopt-derive v0.4.15
[INFO] [stderr]     Checking structopt v0.3.22
[INFO] [stderr]     Checking slb v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | /     /// A flat-map pure function, which is a bash command line string
[INFO] [stdout] 69 | |     /// that performs line-by-line operations on the input to emit
[INFO] [stdout] 70 | |     /// output lines for reduction.
[INFO] [stdout] 71 | |     ///
[INFO] [stdout] 72 | |     /// By default, this is just the identity, equivalent to `cat`.
[INFO] [stdout] 73 | |     #[structopt(long)]
[INFO] [stdout] 74 | |     mapper: Option<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/main.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | /     /// A flat-map pure function, which is a bash command line string
[INFO] [stdout] 69 | |     /// that performs line-by-line operations on the input to emit
[INFO] [stdout] 70 | |     /// output lines for reduction.
[INFO] [stdout] 71 | |     ///
[INFO] [stdout] 72 | |     /// By default, this is just the identity, equivalent to `cat`.
[INFO] [stdout] 73 | |     #[structopt(long)]
[INFO] [stdout] 74 | |     mapper: Option<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/main.rs:76:5
[INFO] [stdout]    |
[INFO] [stdout] 76 | /     /// The folder function.
[INFO] [stdout] 77 | |     ///
[INFO] [stdout] 78 | |     /// Multiple instances of this same process are created with the same
[INFO] [stdout] 79 | |     /// command-line string. Text lines from mapper output are fed
[INFO] [stdout] ...  |
[INFO] [stdout] 82 | |     #[structopt(long)]
[INFO] [stdout] 83 | |     folder: String,
[INFO] [stdout]    | |__________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:76:5
[INFO] [stdout]    |
[INFO] [stdout] 76 | /     /// The folder function.
[INFO] [stdout] 77 | |     ///
[INFO] [stdout] 78 | |     /// Multiple instances of this same process are created with the same
[INFO] [stdout] 79 | |     /// command-line string. Text lines from mapper output are fed
[INFO] [stdout] ...  |
[INFO] [stdout] 82 | |     #[structopt(long)]
[INFO] [stdout] 83 | |     folder: String,
[INFO] [stdout]    | |__________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/main.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 | /     /// The input files to read lines from.
[INFO] [stdout] 86 | |     #[structopt(long)]
[INFO] [stdout] 87 | |     infile: Vec<PathBuf>,
[INFO] [stdout]    | |________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/main.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 | /     /// The input files to read lines from.
[INFO] [stdout] 86 | |     #[structopt(long)]
[INFO] [stdout] 87 | |     infile: Vec<PathBuf>,
[INFO] [stdout]    | |________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/main.rs:89:5
[INFO] [stdout]    |
[INFO] [stdout] 89 | /     /// Output file prefixes.
[INFO] [stdout] 90 | |     #[structopt(long)]
[INFO] [stdout] 91 | |     outprefix: PathBuf,
[INFO] [stdout]    | |______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/main.rs:89:5
[INFO] [stdout]    |
[INFO] [stdout] 89 | /     /// Output file prefixes.
[INFO] [stdout] 90 | |     #[structopt(long)]
[INFO] [stdout] 91 | |     outprefix: PathBuf,
[INFO] [stdout]    | |______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `slb` (bin "slb") due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `slb` (bin "slb" test) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "da850c9a751f8aebd7011d20b3e4e9fac6e31c3578b8c2d20db14248cce4391c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da850c9a751f8aebd7011d20b3e4e9fac6e31c3578b8c2d20db14248cce4391c", kill_on_drop: false }`
[INFO] [stdout] da850c9a751f8aebd7011d20b3e4e9fac6e31c3578b8c2d20db14248cce4391c
