[INFO] cloning repository https://github.com/engimatic/rust-study
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/engimatic/rust-study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fengimatic%2Frust-study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fengimatic%2Frust-study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3ecfc2bf3ab89ba334601b9a29068ea3b01a529e
[INFO] checking engimatic/rust-study against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fengimatic%2Frust-study" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/engimatic/rust-study 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/engimatic/rust-study
[INFO] finished tweaking git repo https://github.com/engimatic/rust-study
[INFO] tweaked toml for git repo https://github.com/engimatic/rust-study written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/engimatic/rust-study 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 blocking v1.4.1
[INFO] [stderr]   Downloaded rustix v0.37.25
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 59ac4d476de8d8de7359173b0c1d5183b00bb86f5820de4a18c215fbb5564815
[INFO] running `Command { std: "docker" "start" "-a" "59ac4d476de8d8de7359173b0c1d5183b00bb86f5820de4a18c215fbb5564815", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "59ac4d476de8d8de7359173b0c1d5183b00bb86f5820de4a18c215fbb5564815", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59ac4d476de8d8de7359173b0c1d5183b00bb86f5820de4a18c215fbb5564815", kill_on_drop: false }`
[INFO] [stdout] 59ac4d476de8d8de7359173b0c1d5183b00bb86f5820de4a18c215fbb5564815
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 18e03b94b12fb751e85c3ff049f26ffb50354d170964fcbabbdc6d03c994db72
[INFO] running `Command { std: "docker" "start" "-a" "18e03b94b12fb751e85c3ff049f26ffb50354d170964fcbabbdc6d03c994db72", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]     Checking value-bag v1.4.1
[INFO] [stderr]     Checking parking v2.1.1
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling rustix v0.37.25
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking concurrent-queue v2.3.0
[INFO] [stderr]     Checking io-lifetimes v1.0.11
[INFO] [stderr]     Checking futures-sink v0.3.28
[INFO] [stderr]     Checking async-task v4.4.1
[INFO] [stderr]     Checking socket2 v0.4.9
[INFO] [stderr]     Checking piper v0.2.1
[INFO] [stderr]     Checking tracing v0.1.39
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking futures-lite v1.13.0
[INFO] [stderr]     Checking polling v2.8.0
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking blocking v1.4.1
[INFO] [stderr]     Checking async-executor v1.6.0
[INFO] [stderr]     Checking async-io v1.13.0
[INFO] [stderr]     Checking async-global-executor v2.3.1
[INFO] [stderr]    Compiling async-attributes v1.1.2
[INFO] [stderr]     Checking futures-executor v0.3.28
[INFO] [stderr]     Checking futures v0.3.28
[INFO] [stderr]     Checking async-std v1.12.0
[INFO] [stderr]     Checking rust-study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.26s
[INFO] running `Command { std: "docker" "inspect" "18e03b94b12fb751e85c3ff049f26ffb50354d170964fcbabbdc6d03c994db72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18e03b94b12fb751e85c3ff049f26ffb50354d170964fcbabbdc6d03c994db72", kill_on_drop: false }`
[INFO] [stdout] 18e03b94b12fb751e85c3ff049f26ffb50354d170964fcbabbdc6d03c994db72
[INFO] checking engimatic/rust-study against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fengimatic%2Frust-study" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/engimatic/rust-study 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/engimatic/rust-study
[INFO] finished tweaking git repo https://github.com/engimatic/rust-study
[INFO] tweaked toml for git repo https://github.com/engimatic/rust-study written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/engimatic/rust-study 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 1fa2f9560b47b4c8cc71909fede4fa42bd0a0cda5825ae424f0cc1070fd00e97
[INFO] running `Command { std: "docker" "start" "-a" "1fa2f9560b47b4c8cc71909fede4fa42bd0a0cda5825ae424f0cc1070fd00e97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1fa2f9560b47b4c8cc71909fede4fa42bd0a0cda5825ae424f0cc1070fd00e97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fa2f9560b47b4c8cc71909fede4fa42bd0a0cda5825ae424f0cc1070fd00e97", kill_on_drop: false }`
[INFO] [stdout] 1fa2f9560b47b4c8cc71909fede4fa42bd0a0cda5825ae424f0cc1070fd00e97
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 7948a42325d60e610059899738a26a5d709ea1a82c1e5e0a76398b6dde94fc8e
[INFO] running `Command { std: "docker" "start" "-a" "7948a42325d60e610059899738a26a5d709ea1a82c1e5e0a76398b6dde94fc8e", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]     Checking value-bag v1.4.1
[INFO] [stderr]     Checking parking v2.1.1
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling rustix v0.37.25
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]     Checking async-task v4.4.1
[INFO] [stderr]     Checking concurrent-queue v2.3.0
[INFO] [stderr]     Checking io-lifetimes v1.0.11
[INFO] [stderr]     Checking futures-sink v0.3.28
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking socket2 v0.4.9
[INFO] [stderr]     Checking tracing v0.1.39
[INFO] [stderr]     Checking piper v0.2.1
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]     Checking futures-lite v1.13.0
[INFO] [stderr]     Checking polling v2.8.0
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking async-executor v1.6.0
[INFO] [stderr]     Checking blocking v1.4.1
[INFO] [stderr]     Checking async-io v1.13.0
[INFO] [stderr]     Checking async-global-executor v2.3.1
[INFO] [stderr]    Compiling async-attributes v1.1.2
[INFO] [stderr]     Checking async-std v1.12.0
[INFO] [stderr]     Checking futures-executor v0.3.28
[INFO] [stderr]     Checking futures v0.3.28
[INFO] [stderr]     Checking rust-study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.53s
[INFO] running `Command { std: "docker" "inspect" "7948a42325d60e610059899738a26a5d709ea1a82c1e5e0a76398b6dde94fc8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7948a42325d60e610059899738a26a5d709ea1a82c1e5e0a76398b6dde94fc8e", kill_on_drop: false }`
[INFO] [stdout] 7948a42325d60e610059899738a26a5d709ea1a82c1e5e0a76398b6dde94fc8e