[INFO] cloning repository https://github.com/mmNalaka/m-task
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mmNalaka/m-task" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FmmNalaka%2Fm-task", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FmmNalaka%2Fm-task'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 65fbb1ac58109a7a33a3c760ec3751b074ca165b
[INFO] checking mmNalaka/m-task against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FmmNalaka%2Fm-task" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mmNalaka/m-task on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mmNalaka/m-task
[INFO] finished tweaking git repo https://github.com/mmNalaka/m-task
[INFO] tweaked toml for git repo https://github.com/mmNalaka/m-task written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mmNalaka/m-task 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d77a9f20b7f7ce6ed1b87ead83c22fa11e012bd3823abd9b2c19352b7384730e
[INFO] running `Command { std: "docker" "start" "-a" "d77a9f20b7f7ce6ed1b87ead83c22fa11e012bd3823abd9b2c19352b7384730e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d77a9f20b7f7ce6ed1b87ead83c22fa11e012bd3823abd9b2c19352b7384730e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d77a9f20b7f7ce6ed1b87ead83c22fa11e012bd3823abd9b2c19352b7384730e", kill_on_drop: false }`
[INFO] [stdout] d77a9f20b7f7ce6ed1b87ead83c22fa11e012bd3823abd9b2c19352b7384730e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e278a43607ff7bb83d98da8c47ba7f16b90d2ba43aef86a6f5de708db6d9a3c
[INFO] running `Command { std: "docker" "start" "-a" "1e278a43607ff7bb83d98da8c47ba7f16b90d2ba43aef86a6f5de708db6d9a3c", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]     Checking tracing-core v0.1.21
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]    Compiling eyre v0.6.5
[INFO] [stderr]     Checking owo-colors v1.3.0
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking tracing-subscriber v0.2.25
[INFO] [stderr]     Checking object v0.27.1
[INFO] [stderr]    Compiling backtrace v0.3.63
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling tracing-attributes v0.1.18
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking structopt v0.3.25
[INFO] [stderr]     Checking tracing v0.1.29
[INFO] [stderr]     Checking tracing-error v0.1.2
[INFO] [stderr]     Checking color-spantrace v0.1.6
[INFO] [stderr]     Checking color-eyre v0.5.11
[INFO] [stderr]     Checking m-task v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `cmd` is never read
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Opt {
[INFO] [stdout]   |        --- field in this struct
[INFO] [stdout] 6 |     #[structopt(subcommand)]
[INFO] [stdout] 7 |     cmd: Command,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Opt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `title` is never read
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Write {
[INFO] [stdout]    |     ----- field in this variant
[INFO] [stdout] 13 |         #[structopt(short, long)]
[INFO] [stdout] 14 |         title: Option<String>
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `cmd` is never read
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Opt {
[INFO] [stdout]   |        --- field in this struct
[INFO] [stdout] 6 |     #[structopt(subcommand)]
[INFO] [stdout] 7 |     cmd: Command,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Opt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `title` is never read
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Write {
[INFO] [stdout]    |     ----- field in this variant
[INFO] [stdout] 13 |         #[structopt(short, long)]
[INFO] [stdout] 14 |         title: Option<String>
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.70s
[INFO] running `Command { std: "docker" "inspect" "1e278a43607ff7bb83d98da8c47ba7f16b90d2ba43aef86a6f5de708db6d9a3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e278a43607ff7bb83d98da8c47ba7f16b90d2ba43aef86a6f5de708db6d9a3c", kill_on_drop: false }`
[INFO] [stdout] 1e278a43607ff7bb83d98da8c47ba7f16b90d2ba43aef86a6f5de708db6d9a3c
[INFO] checking mmNalaka/m-task against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FmmNalaka%2Fm-task" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mmNalaka/m-task on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mmNalaka/m-task
[INFO] finished tweaking git repo https://github.com/mmNalaka/m-task
[INFO] tweaked toml for git repo https://github.com/mmNalaka/m-task written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/mmNalaka/m-task 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 28bb69d14a2009f2aceead7a0727b05600587aae54c484e306d63f2a09b7cd53
[INFO] running `Command { std: "docker" "start" "-a" "28bb69d14a2009f2aceead7a0727b05600587aae54c484e306d63f2a09b7cd53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "28bb69d14a2009f2aceead7a0727b05600587aae54c484e306d63f2a09b7cd53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28bb69d14a2009f2aceead7a0727b05600587aae54c484e306d63f2a09b7cd53", kill_on_drop: false }`
[INFO] [stdout] 28bb69d14a2009f2aceead7a0727b05600587aae54c484e306d63f2a09b7cd53
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7fe0d256a36d338324f6b5d06dfdf268a128007a66385405fdd949f1630b7511
[INFO] running `Command { std: "docker" "start" "-a" "7fe0d256a36d338324f6b5d06dfdf268a128007a66385405fdd949f1630b7511", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling eyre v0.6.5
[INFO] [stderr]     Checking tracing-core v0.1.21
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking owo-colors v1.3.0
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]     Checking tracing-subscriber v0.2.25
[INFO] [stderr]    Compiling backtrace v0.3.63
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking object v0.27.1
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling tracing-attributes v0.1.18
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking tracing v0.1.29
[INFO] [stderr]     Checking tracing-error v0.1.2
[INFO] [stderr]     Checking color-spantrace v0.1.6
[INFO] [stderr]     Checking structopt v0.3.25
[INFO] [stderr]     Checking color-eyre v0.5.11
[INFO] [stderr]     Checking m-task v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `cmd` is never read
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Opt {
[INFO] [stdout]   |        --- field in this struct
[INFO] [stdout] 6 |     #[structopt(subcommand)]
[INFO] [stdout] 7 |     cmd: Command,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Opt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `title` is never read
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Write {
[INFO] [stdout]    |     ----- field in this variant
[INFO] [stdout] 13 |         #[structopt(short, long)]
[INFO] [stdout] 14 |         title: Option<String>
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `cmd` is never read
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Opt {
[INFO] [stdout]   |        --- field in this struct
[INFO] [stdout] 6 |     #[structopt(subcommand)]
[INFO] [stdout] 7 |     cmd: Command,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Opt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `title` is never read
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Write {
[INFO] [stdout]    |     ----- field in this variant
[INFO] [stdout] 13 |         #[structopt(short, long)]
[INFO] [stdout] 14 |         title: Option<String>
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.39s
[INFO] running `Command { std: "docker" "inspect" "7fe0d256a36d338324f6b5d06dfdf268a128007a66385405fdd949f1630b7511", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fe0d256a36d338324f6b5d06dfdf268a128007a66385405fdd949f1630b7511", kill_on_drop: false }`
[INFO] [stdout] 7fe0d256a36d338324f6b5d06dfdf268a128007a66385405fdd949f1630b7511