[INFO] fetching crate just-the-code 1.0.0...
[INFO] checking just-the-code-1.0.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate just-the-code 1.0.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate just-the-code 1.0.0
[INFO] finished tweaking crates.io crate just-the-code 1.0.0
[INFO] tweaked toml for crates.io crate just-the-code 1.0.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate just-the-code 1.0.0 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 just-the-code 1.0.0 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] 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] b8653f944620eb7f57d53d4039cf743e4cf5043b63f275ea62b7ccd66775879f
[INFO] running `Command { std: "docker" "start" "-a" "b8653f944620eb7f57d53d4039cf743e4cf5043b63f275ea62b7ccd66775879f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b8653f944620eb7f57d53d4039cf743e4cf5043b63f275ea62b7ccd66775879f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8653f944620eb7f57d53d4039cf743e4cf5043b63f275ea62b7ccd66775879f", kill_on_drop: false }`
[INFO] [stdout] b8653f944620eb7f57d53d4039cf743e4cf5043b63f275ea62b7ccd66775879f
[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] ea933dd8dcad7f3bbe7ed5ef7d599e6b52a0634116d8f02078a6bde11b8ff2db
[INFO] running `Command { std: "docker" "start" "-a" "ea933dd8dcad7f3bbe7ed5ef7d599e6b52a0634116d8f02078a6bde11b8ff2db", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.50
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]     Checking winnow v0.6.2
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking dirs-sys v0.4.1
[INFO] [stderr]     Checking directories v5.0.1
[INFO] [stderr]    Compiling gumdrop_derive v0.8.1
[INFO] [stderr]     Checking gumdrop v0.8.1
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]     Checking indexmap v2.2.3
[INFO] [stderr]     Checking serde_spanned v0.6.5
[INFO] [stderr]     Checking toml_datetime v0.6.5
[INFO] [stderr]     Checking toml_edit v0.22.6
[INFO] [stderr]     Checking toml v0.8.10
[INFO] [stderr]     Checking just-the-code v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/config.rs:85:10
[INFO] [stdout]    |
[INFO] [stdout] 85 | #[derive(Options)]
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/config.rs:85:10
[INFO] [stdout]    |
[INFO] [stdout] 85 | #[derive(Options)]
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `just-the-code` (bin "just-the-code") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `just-the-code` (bin "just-the-code" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "ea933dd8dcad7f3bbe7ed5ef7d599e6b52a0634116d8f02078a6bde11b8ff2db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea933dd8dcad7f3bbe7ed5ef7d599e6b52a0634116d8f02078a6bde11b8ff2db", kill_on_drop: false }`
[INFO] [stdout] ea933dd8dcad7f3bbe7ed5ef7d599e6b52a0634116d8f02078a6bde11b8ff2db