[INFO] cloning repository https://github.com/hyone/arithmetic-evaluator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hyone/arithmetic-evaluator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhyone%2Farithmetic-evaluator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhyone%2Farithmetic-evaluator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 684c3f566ffea40c92eb23028b59481480c60ccb
[INFO] checking hyone/arithmetic-evaluator against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhyone%2Farithmetic-evaluator" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hyone/arithmetic-evaluator 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/hyone/arithmetic-evaluator
[INFO] finished tweaking git repo https://github.com/hyone/arithmetic-evaluator
[INFO] tweaked toml for git repo https://github.com/hyone/arithmetic-evaluator written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/hyone/arithmetic-evaluator 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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded docopt v1.0.2
[INFO] [stderr]   Downloaded ascii v0.9.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] a3151a9e7a1fcbe67171693927f37ca18dd0fc4233d0ae8883957189e6f5f233
[INFO] running `Command { std: "docker" "start" "-a" "a3151a9e7a1fcbe67171693927f37ca18dd0fc4233d0ae8883957189e6f5f233", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a3151a9e7a1fcbe67171693927f37ca18dd0fc4233d0ae8883957189e6f5f233", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3151a9e7a1fcbe67171693927f37ca18dd0fc4233d0ae8883957189e6f5f233", kill_on_drop: false }`
[INFO] [stdout] a3151a9e7a1fcbe67171693927f37ca18dd0fc4233d0ae8883957189e6f5f233
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 7ab349fcb20a722ffc08489f204a929cf75b3bc29fc01c411956a0ce3637837e
[INFO] running `Command { std: "docker" "start" "-a" "7ab349fcb20a722ffc08489f204a929cf75b3bc29fc01c411956a0ce3637837e", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]    Compiling regex v1.1.5
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]    Compiling serde v1.0.90
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.6.6
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking strsim v0.7.0
[INFO] [stderr]     Checking ascii v0.9.1
[INFO] [stderr]     Checking either v1.5.1
[INFO] [stderr]     Checking aho-corasick v0.7.3
[INFO] [stderr]     Checking combine v3.8.1
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]    Compiling serde_derive v1.0.90
[INFO] [stderr]     Checking docopt v1.0.2
[INFO] [stderr]     Checking arithmetic-evaluator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `arg_file` is never read
[INFO] [stdout]   --> src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Args {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 35 |     flag_e: Option<String>,
[INFO] [stdout] 36 |     arg_file: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Args` 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 `arg_file` is never read
[INFO] [stdout]   --> src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Args {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 35 |     flag_e: Option<String>,
[INFO] [stdout] 36 |     arg_file: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Args` 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.70s
[INFO] running `Command { std: "docker" "inspect" "7ab349fcb20a722ffc08489f204a929cf75b3bc29fc01c411956a0ce3637837e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ab349fcb20a722ffc08489f204a929cf75b3bc29fc01c411956a0ce3637837e", kill_on_drop: false }`
[INFO] [stdout] 7ab349fcb20a722ffc08489f204a929cf75b3bc29fc01c411956a0ce3637837e
[INFO] checking hyone/arithmetic-evaluator against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhyone%2Farithmetic-evaluator" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hyone/arithmetic-evaluator 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/hyone/arithmetic-evaluator
[INFO] finished tweaking git repo https://github.com/hyone/arithmetic-evaluator
[INFO] tweaked toml for git repo https://github.com/hyone/arithmetic-evaluator written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/hyone/arithmetic-evaluator 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-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7b3f38d7eaa4a35096c684607f11ed36ff808b2be586bf9df73098568c8e3fc8
[INFO] running `Command { std: "docker" "start" "-a" "7b3f38d7eaa4a35096c684607f11ed36ff808b2be586bf9df73098568c8e3fc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7b3f38d7eaa4a35096c684607f11ed36ff808b2be586bf9df73098568c8e3fc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b3f38d7eaa4a35096c684607f11ed36ff808b2be586bf9df73098568c8e3fc8", kill_on_drop: false }`
[INFO] [stdout] 7b3f38d7eaa4a35096c684607f11ed36ff808b2be586bf9df73098568c8e3fc8
[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" "-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] 61f3a5f9c3d0c8f2b2f2def61b464d7b90b6648c4f4da67d8c8f4bf3284a49fa
[INFO] running `Command { std: "docker" "start" "-a" "61f3a5f9c3d0c8f2b2f2def61b464d7b90b6648c4f4da67d8c8f4bf3284a49fa", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.5
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling serde v1.0.90
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking strsim v0.7.0
[INFO] [stderr]     Checking regex-syntax v0.6.6
[INFO] [stderr]     Checking ascii v0.9.1
[INFO] [stderr]     Checking either v1.5.1
[INFO] [stderr]     Checking aho-corasick v0.7.3
[INFO] [stderr]     Checking combine v3.8.1
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]    Compiling serde_derive v1.0.90
[INFO] [stderr]     Checking docopt v1.0.2
[INFO] [stderr]     Checking arithmetic-evaluator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `arg_file` is never read
[INFO] [stdout]   --> src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Args {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 35 |     flag_e: Option<String>,
[INFO] [stdout] 36 |     arg_file: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Args` 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `arg_file` is never read
[INFO] [stdout]   --> src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Args {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 35 |     flag_e: Option<String>,
[INFO] [stdout] 36 |     arg_file: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Args` 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 14.16s
[INFO] running `Command { std: "docker" "inspect" "61f3a5f9c3d0c8f2b2f2def61b464d7b90b6648c4f4da67d8c8f4bf3284a49fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61f3a5f9c3d0c8f2b2f2def61b464d7b90b6648c4f4da67d8c8f4bf3284a49fa", kill_on_drop: false }`
[INFO] [stdout] 61f3a5f9c3d0c8f2b2f2def61b464d7b90b6648c4f4da67d8c8f4bf3284a49fa