[INFO] cloning repository https://github.com/NoobTenLuka/multistack
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/NoobTenLuka/multistack" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNoobTenLuka%2Fmultistack", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNoobTenLuka%2Fmultistack'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 562165478f3c484c007fe23aeb76176905f16440
[INFO] checking NoobTenLuka/multistack against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNoobTenLuka%2Fmultistack" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NoobTenLuka/multistack 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/NoobTenLuka/multistack
[INFO] finished tweaking git repo https://github.com/NoobTenLuka/multistack
[INFO] tweaked toml for git repo https://github.com/NoobTenLuka/multistack written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/NoobTenLuka/multistack 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-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] a60d357de8ac4a2f5deba10070c837ba594a1e0a8d355d69cae315f2ee1f4fd2
[INFO] running `Command { std: "docker" "start" "-a" "a60d357de8ac4a2f5deba10070c837ba594a1e0a8d355d69cae315f2ee1f4fd2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a60d357de8ac4a2f5deba10070c837ba594a1e0a8d355d69cae315f2ee1f4fd2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a60d357de8ac4a2f5deba10070c837ba594a1e0a8d355d69cae315f2ee1f4fd2", kill_on_drop: false }`
[INFO] [stdout] a60d357de8ac4a2f5deba10070c837ba594a1e0a8d355d69cae315f2ee1f4fd2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 3f364ee73d4a1354287a97ea86c312faf272382baed6889ad47f81272155efb7
[INFO] running `Command { std: "docker" "start" "-a" "3f364ee73d4a1354287a97ea86c312faf272382baed6889ad47f81272155efb7", kill_on_drop: false }`
[INFO] [stderr]     Checking multistack v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] running `Command { std: "docker" "inspect" "3f364ee73d4a1354287a97ea86c312faf272382baed6889ad47f81272155efb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f364ee73d4a1354287a97ea86c312faf272382baed6889ad47f81272155efb7", kill_on_drop: false }`
[INFO] [stdout] 3f364ee73d4a1354287a97ea86c312faf272382baed6889ad47f81272155efb7
[INFO] checking NoobTenLuka/multistack against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNoobTenLuka%2Fmultistack" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NoobTenLuka/multistack 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/NoobTenLuka/multistack
[INFO] finished tweaking git repo https://github.com/NoobTenLuka/multistack
[INFO] tweaked toml for git repo https://github.com/NoobTenLuka/multistack written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/NoobTenLuka/multistack 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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 7bf0696a8b893cf5c866d4a304d2bab30c749aaecac91d029918984a5a256664
[INFO] running `Command { std: "docker" "start" "-a" "7bf0696a8b893cf5c866d4a304d2bab30c749aaecac91d029918984a5a256664", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7bf0696a8b893cf5c866d4a304d2bab30c749aaecac91d029918984a5a256664", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7bf0696a8b893cf5c866d4a304d2bab30c749aaecac91d029918984a5a256664", kill_on_drop: false }`
[INFO] [stdout] 7bf0696a8b893cf5c866d4a304d2bab30c749aaecac91d029918984a5a256664
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 31791d6527f66c6bfa19b3ddba3dac9fe5b4bba71e5d624035eb42eb2a5fd659
[INFO] running `Command { std: "docker" "start" "-a" "31791d6527f66c6bfa19b3ddba3dac9fe5b4bba71e5d624035eb42eb2a5fd659", kill_on_drop: false }`
[INFO] [stderr]     Checking multistack v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/main.rs:33:13
[INFO] [stdout]    |
[INFO] [stdout] 33 | /             if let Some(previous) = &previous_node.previous {
[INFO] [stdout] 34 | |                 return Some(mem::replace(&mut self.head, Some(previous.clone())).unwrap().value.clone());
[INFO] [stdout] 35 | |             } else {
[INFO] [stdout] 36 | |                 return Some(mem::replace(&mut self.head, None).unwrap().value.clone());
[INFO] [stdout] 37 | |             };
[INFO] [stdout]    | |_____________^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/main.rs:33:13
[INFO] [stdout]    |
[INFO] [stdout] 33 | /             if let Some(previous) = &previous_node.previous {
[INFO] [stdout] 34 | |                 return Some(mem::replace(&mut self.head, Some(previous.clone())).unwrap().value.clone());
[INFO] [stdout] 35 | |             } else {
[INFO] [stdout] 36 | |                 return Some(mem::replace(&mut self.head, None).unwrap().value.clone());
[INFO] [stdout] 37 | |             };
[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 `multistack` (bin "multistack") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `multistack` (bin "multistack" test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "31791d6527f66c6bfa19b3ddba3dac9fe5b4bba71e5d624035eb42eb2a5fd659", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31791d6527f66c6bfa19b3ddba3dac9fe5b4bba71e5d624035eb42eb2a5fd659", kill_on_drop: false }`
[INFO] [stdout] 31791d6527f66c6bfa19b3ddba3dac9fe5b4bba71e5d624035eb42eb2a5fd659