[INFO] fetching crate kurobako_solvers 0.2.2...
[INFO] checking kurobako_solvers-0.2.2 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate kurobako_solvers 0.2.2 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate kurobako_solvers 0.2.2
[INFO] finished tweaking crates.io crate kurobako_solvers 0.2.2
[INFO] tweaked toml for crates.io crate kurobako_solvers 0.2.2 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate kurobako_solvers 0.2.2 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 77 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] [stderr]       Adding trackable v0.2.24 (available: v1.3.0)
[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] d08b53243c7712b8db87003c2ae30b02df81baee5dd338f2a93a28ae14de8dc1
[INFO] running `Command { std: "docker" "start" "-a" "d08b53243c7712b8db87003c2ae30b02df81baee5dd338f2a93a28ae14de8dc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d08b53243c7712b8db87003c2ae30b02df81baee5dd338f2a93a28ae14de8dc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d08b53243c7712b8db87003c2ae30b02df81baee5dd338f2a93a28ae14de8dc1", kill_on_drop: false }`
[INFO] [stdout] d08b53243c7712b8db87003c2ae30b02df81baee5dd338f2a93a28ae14de8dc1
[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] 896c82d9c00dddaa7d7d3a7da75eaa703186b2dbb1cb42c104ebf56f9ab45ffa
[INFO] running `Command { std: "docker" "start" "-a" "896c82d9c00dddaa7d7d3a7da75eaa703186b2dbb1cb42c104ebf56f9ab45ffa", kill_on_drop: false }`
[INFO] [stderr]    Compiling generic-array v0.14.9
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling rlua v0.17.1
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]     Checking tempfile v3.23.0
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking sha2 v0.9.9
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]    Compiling trackable_derive v1.0.0
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking trackable v1.3.0
[INFO] [stderr]     Checking trackable v0.2.24
[INFO] [stderr]     Checking yamakan v0.2.0
[INFO] [stderr]     Checking structopt v0.3.26
[INFO] [stderr]     Checking kurobako_core v0.1.12
[INFO] [stderr]     Checking kurobako_solvers v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/optuna.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 | /     /// Log level.
[INFO] [stdout] 47 | |     #[structopt(
[INFO] [stdout] 48 | |         long,
[INFO] [stdout] 49 | |         default_value = "warning",
[INFO] [stdout] ...  |
[INFO] [stdout] 53 | |     #[serde(default = "defaults::loglevel")]
[INFO] [stdout] 54 | |     pub loglevel: 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/optuna.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 56 | /     /// Sampler class name (e.g., "TPESampler").
[INFO] [stdout] 57 | |     #[structopt(long)]
[INFO] [stdout] 58 | |     #[serde(skip_serializing_if = "Option::is_none")]
[INFO] [stdout] 59 | |     #[serde(default)]
[INFO] [stdout] 60 | |     pub sampler: Option<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/optuna.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | /     /// Sampler arguments (e.g., "{\"seed\": 10}").
[INFO] [stdout] 63 | |     #[structopt(long)]
[INFO] [stdout] 64 | |     #[serde(skip_serializing_if = "Option::is_none")]
[INFO] [stdout] 65 | |     #[serde(default)]
[INFO] [stdout] 66 | |     pub sampler_kwargs: Option<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/optuna.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | /     /// Pruner class name (e.g., "MedianPruner").
[INFO] [stdout] 69 | |     #[structopt(long)]
[INFO] [stdout] 70 | |     #[serde(skip_serializing_if = "Option::is_none")]
[INFO] [stdout] 71 | |     #[serde(default)]
[INFO] [stdout] 72 | |     pub pruner: Option<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/optuna.rs:74:5
[INFO] [stdout]    |
[INFO] [stdout] 74 | /     /// Pruner arguments (e.g., "{\"n_warmup_steps\": 10}").
[INFO] [stdout] 75 | |     #[structopt(long)]
[INFO] [stdout] 76 | |     #[serde(skip_serializing_if = "Option::is_none")]
[INFO] [stdout] 77 | |     #[serde(default)]
[INFO] [stdout] 78 | |     pub pruner_kwargs: Option<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/optuna.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 | /     /// Log level.
[INFO] [stdout] 47 | |     #[structopt(
[INFO] [stdout] 48 | |         long,
[INFO] [stdout] 49 | |         default_value = "warning",
[INFO] [stdout] ...  |
[INFO] [stdout] 53 | |     #[serde(default = "defaults::loglevel")]
[INFO] [stdout] 54 | |     pub loglevel: 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/optuna.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 56 | /     /// Sampler class name (e.g., "TPESampler").
[INFO] [stdout] 57 | |     #[structopt(long)]
[INFO] [stdout] 58 | |     #[serde(skip_serializing_if = "Option::is_none")]
[INFO] [stdout] 59 | |     #[serde(default)]
[INFO] [stdout] 60 | |     pub sampler: Option<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/optuna.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | /     /// Sampler arguments (e.g., "{\"seed\": 10}").
[INFO] [stdout] 63 | |     #[structopt(long)]
[INFO] [stdout] 64 | |     #[serde(skip_serializing_if = "Option::is_none")]
[INFO] [stdout] 65 | |     #[serde(default)]
[INFO] [stdout] 66 | |     pub sampler_kwargs: Option<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/optuna.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | /     /// Pruner class name (e.g., "MedianPruner").
[INFO] [stdout] 69 | |     #[structopt(long)]
[INFO] [stdout] 70 | |     #[serde(skip_serializing_if = "Option::is_none")]
[INFO] [stdout] 71 | |     #[serde(default)]
[INFO] [stdout] 72 | |     pub pruner: Option<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/optuna.rs:74:5
[INFO] [stdout]    |
[INFO] [stdout] 74 | /     /// Pruner arguments (e.g., "{\"n_warmup_steps\": 10}").
[INFO] [stdout] 75 | |     #[structopt(long)]
[INFO] [stdout] 76 | |     #[serde(skip_serializing_if = "Option::is_none")]
[INFO] [stdout] 77 | |     #[serde(default)]
[INFO] [stdout] 78 | |     pub pruner_kwargs: Option<String>,
[INFO] [stdout]    | |_____________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kurobako_solvers` (lib) due to 5 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `kurobako_solvers` (lib test) due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "896c82d9c00dddaa7d7d3a7da75eaa703186b2dbb1cb42c104ebf56f9ab45ffa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "896c82d9c00dddaa7d7d3a7da75eaa703186b2dbb1cb42c104ebf56f9ab45ffa", kill_on_drop: false }`
[INFO] [stdout] 896c82d9c00dddaa7d7d3a7da75eaa703186b2dbb1cb42c104ebf56f9ab45ffa
