[INFO] cloning repository https://github.com/WhereIsW4ldo/calculator_rust_multithread
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/WhereIsW4ldo/calculator_rust_multithread" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWhereIsW4ldo%2Fcalculator_rust_multithread", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWhereIsW4ldo%2Fcalculator_rust_multithread'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 63410ea569504694906c7b526e6dc62973f18ffc
[INFO] checking WhereIsW4ldo/calculator_rust_multithread against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWhereIsW4ldo%2Fcalculator_rust_multithread" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread
[INFO] finished tweaking git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread
[INFO] tweaked toml for git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ab66c0f1130bd06265196413b4c63ac60a83c9a06936c2eb89026162d601ba04
[INFO] running `Command { std: "docker" "start" "-a" "ab66c0f1130bd06265196413b4c63ac60a83c9a06936c2eb89026162d601ba04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab66c0f1130bd06265196413b4c63ac60a83c9a06936c2eb89026162d601ba04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab66c0f1130bd06265196413b4c63ac60a83c9a06936c2eb89026162d601ba04", kill_on_drop: false }`
[INFO] [stdout] ab66c0f1130bd06265196413b4c63ac60a83c9a06936c2eb89026162d601ba04
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e5bfb024fae2a2b052e8e3a5bcc4e41e2175ae141931e6f2ece28a0b052a6c3c
[INFO] running `Command { std: "docker" "start" "-a" "e5bfb024fae2a2b052e8e3a5bcc4e41e2175ae141931e6f2ece28a0b052a6c3c", kill_on_drop: false }`
[INFO] [stderr]     Checking calculator_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] running `Command { std: "docker" "inspect" "e5bfb024fae2a2b052e8e3a5bcc4e41e2175ae141931e6f2ece28a0b052a6c3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e5bfb024fae2a2b052e8e3a5bcc4e41e2175ae141931e6f2ece28a0b052a6c3c", kill_on_drop: false }`
[INFO] [stdout] e5bfb024fae2a2b052e8e3a5bcc4e41e2175ae141931e6f2ece28a0b052a6c3c
[INFO] checking WhereIsW4ldo/calculator_rust_multithread against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWhereIsW4ldo%2Fcalculator_rust_multithread" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread
[INFO] finished tweaking git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread
[INFO] tweaked toml for git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/WhereIsW4ldo/calculator_rust_multithread 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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 94157451d0098cd9cfc14879251f39095e0d8c708c099562c4b66b6989b24872
[INFO] running `Command { std: "docker" "start" "-a" "94157451d0098cd9cfc14879251f39095e0d8c708c099562c4b66b6989b24872", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "94157451d0098cd9cfc14879251f39095e0d8c708c099562c4b66b6989b24872", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94157451d0098cd9cfc14879251f39095e0d8c708c099562c4b66b6989b24872", kill_on_drop: false }`
[INFO] [stdout] 94157451d0098cd9cfc14879251f39095e0d8c708c099562c4b66b6989b24872
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7cf87c45d5f67f111a11fbcb1be0016cf043a6b08b7f89b99667f0dbfd6713ab
[INFO] running `Command { std: "docker" "start" "-a" "7cf87c45d5f67f111a11fbcb1be0016cf043a6b08b7f89b99667f0dbfd6713ab", kill_on_drop: false }`
[INFO] [stderr]     Checking calculator_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/backend.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 | /         match message.parse::<f64>()
[INFO] [stdout] 42 | |         {
[INFO] [stdout] 43 | |             Ok(number) => {
[INFO] [stdout] 44 | |                 self.last_value = number;
[INFO] [stdout] ...  |
[INFO] [stdout] 47 | |             Err(_) => return self.change_value(message),
[INFO] [stdout] 48 | |         };
[INFO] [stdout]    | |_________^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/backend.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 | /         match message.parse::<f64>()
[INFO] [stdout] 42 | |         {
[INFO] [stdout] 43 | |             Ok(number) => {
[INFO] [stdout] 44 | |                 self.last_value = number;
[INFO] [stdout] ...  |
[INFO] [stdout] 47 | |             Err(_) => return self.change_value(message),
[INFO] [stdout] 48 | |         };
[INFO] [stdout]    | |_________^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `calculator_rust` (bin "calculator_rust" test) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `calculator_rust` (bin "calculator_rust") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "7cf87c45d5f67f111a11fbcb1be0016cf043a6b08b7f89b99667f0dbfd6713ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7cf87c45d5f67f111a11fbcb1be0016cf043a6b08b7f89b99667f0dbfd6713ab", kill_on_drop: false }`
[INFO] [stdout] 7cf87c45d5f67f111a11fbcb1be0016cf043a6b08b7f89b99667f0dbfd6713ab