[INFO] cloning repository https://github.com/mchlrhw/rust-containers-from-scratch
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mchlrhw/rust-containers-from-scratch" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmchlrhw%2Frust-containers-from-scratch", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmchlrhw%2Frust-containers-from-scratch'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 044a3c8bce0ffc48dbd1b40babf33a568c8e8898
[INFO] checking mchlrhw/rust-containers-from-scratch against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmchlrhw%2Frust-containers-from-scratch" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mchlrhw/rust-containers-from-scratch 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/mchlrhw/rust-containers-from-scratch
[INFO] finished tweaking git repo https://github.com/mchlrhw/rust-containers-from-scratch
[INFO] tweaked toml for git repo https://github.com/mchlrhw/rust-containers-from-scratch written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mchlrhw/rust-containers-from-scratch 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] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unshare v0.5.0
[INFO] [stderr]   Downloaded cc v1.0.18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] f5bc90af2c01837e10aca7e8443825d9c62ea1c32ff2ea51c62c5f7a186d7bf8
[INFO] running `Command { std: "docker" "start" "-a" "f5bc90af2c01837e10aca7e8443825d9c62ea1c32ff2ea51c62c5f7a186d7bf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f5bc90af2c01837e10aca7e8443825d9c62ea1c32ff2ea51c62c5f7a186d7bf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5bc90af2c01837e10aca7e8443825d9c62ea1c32ff2ea51c62c5f7a186d7bf8", kill_on_drop: false }`
[INFO] [stdout] f5bc90af2c01837e10aca7e8443825d9c62ea1c32ff2ea51c62c5f7a186d7bf8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 26f40d5ed171616ab35c4ffea2219bf76e7dbef0dd0ba548ad59bb819cb21e60
[INFO] running `Command { std: "docker" "start" "-a" "26f40d5ed171616ab35c4ffea2219bf76e7dbef0dd0ba548ad59bb819cb21e60", kill_on_drop: false }`
[INFO] [stderr]    Compiling nix v0.11.0
[INFO] [stderr]     Checking cfg-if v0.1.5
[INFO] [stderr]     Checking bitflags v1.0.3
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]     Checking unshare v0.5.0
[INFO] [stderr]     Checking cfs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.89s
[INFO] running `Command { std: "docker" "inspect" "26f40d5ed171616ab35c4ffea2219bf76e7dbef0dd0ba548ad59bb819cb21e60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26f40d5ed171616ab35c4ffea2219bf76e7dbef0dd0ba548ad59bb819cb21e60", kill_on_drop: false }`
[INFO] [stdout] 26f40d5ed171616ab35c4ffea2219bf76e7dbef0dd0ba548ad59bb819cb21e60
[INFO] checking mchlrhw/rust-containers-from-scratch against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmchlrhw%2Frust-containers-from-scratch" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mchlrhw/rust-containers-from-scratch 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/mchlrhw/rust-containers-from-scratch
[INFO] finished tweaking git repo https://github.com/mchlrhw/rust-containers-from-scratch
[INFO] tweaked toml for git repo https://github.com/mchlrhw/rust-containers-from-scratch written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/mchlrhw/rust-containers-from-scratch 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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 0414382ba5a8630fa1d147c2af11ea1abb8916341e8c2146fcd617e2cdc7fdcf
[INFO] running `Command { std: "docker" "start" "-a" "0414382ba5a8630fa1d147c2af11ea1abb8916341e8c2146fcd617e2cdc7fdcf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0414382ba5a8630fa1d147c2af11ea1abb8916341e8c2146fcd617e2cdc7fdcf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0414382ba5a8630fa1d147c2af11ea1abb8916341e8c2146fcd617e2cdc7fdcf", kill_on_drop: false }`
[INFO] [stdout] 0414382ba5a8630fa1d147c2af11ea1abb8916341e8c2146fcd617e2cdc7fdcf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 38380bf9496aae4de2c7ee399545d4127ec21a786c3a5ad5dd05b6ce5e4248a6
[INFO] running `Command { std: "docker" "start" "-a" "38380bf9496aae4de2c7ee399545d4127ec21a786c3a5ad5dd05b6ce5e4248a6", kill_on_drop: false }`
[INFO] [stderr]    Compiling nix v0.11.0
[INFO] [stderr]     Checking cfg-if v0.1.5
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]     Checking bitflags v1.0.3
[INFO] [stderr]     Checking unshare v0.5.0
[INFO] [stdout] error[E0284]: type annotations needed: cannot satisfy `_ -> _`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/unshare-0.5.0/src/child.rs:254:5
[INFO] [stdout]     |
[INFO] [stdout] 254 | /     if pid == 0 {
[INFO] [stdout] 255 | |         buf[buf.len()-2] = b'0';
[INFO] [stdout] 256 | |         return &buf[buf.len()-2..]
[INFO] [stdout] 257 | |     } else {
[INFO] [stdout] ...   |
[INFO] [stdout] 267 | |         unreachable!("can't format pid");
[INFO] [stdout] 268 | |     };
[INFO] [stdout]     | |_____^ cannot satisfy `_ -> _`
[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 E0284`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unshare` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "38380bf9496aae4de2c7ee399545d4127ec21a786c3a5ad5dd05b6ce5e4248a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38380bf9496aae4de2c7ee399545d4127ec21a786c3a5ad5dd05b6ce5e4248a6", kill_on_drop: false }`
[INFO] [stdout] 38380bf9496aae4de2c7ee399545d4127ec21a786c3a5ad5dd05b6ce5e4248a6