[INFO] cloning repository https://github.com/chinedu360/rust_write_json
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/chinedu360/rust_write_json" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchinedu360%2Frust_write_json", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchinedu360%2Frust_write_json'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0a24e10bf8febe6ce42b8cde7e7b544405d2dd93
[INFO] checking chinedu360/rust_write_json against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchinedu360%2Frust_write_json" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/chinedu360/rust_write_json 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/chinedu360/rust_write_json
[INFO] finished tweaking git repo https://github.com/chinedu360/rust_write_json
[INFO] tweaked toml for git repo https://github.com/chinedu360/rust_write_json written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/chinedu360/rust_write_json 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 1db087a7fd9383302f0593a8ff2df166fb47f9db2235355827ee5273346327c4
[INFO] running `Command { std: "docker" "start" "-a" "1db087a7fd9383302f0593a8ff2df166fb47f9db2235355827ee5273346327c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1db087a7fd9383302f0593a8ff2df166fb47f9db2235355827ee5273346327c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1db087a7fd9383302f0593a8ff2df166fb47f9db2235355827ee5273346327c4", kill_on_drop: false }`
[INFO] [stdout] 1db087a7fd9383302f0593a8ff2df166fb47f9db2235355827ee5273346327c4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 36fc4fcd7a847f1139ceb8002de7b6ffd310bedf4d9ed431e2e62b18e9270ad2
[INFO] running `Command { std: "docker" "start" "-a" "36fc4fcd7a847f1139ceb8002de7b6ffd310bedf4d9ed431e2e62b18e9270ad2", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_json v1.0.105
[INFO] [stderr]     Checking rust_write_json v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.59s
[INFO] running `Command { std: "docker" "inspect" "36fc4fcd7a847f1139ceb8002de7b6ffd310bedf4d9ed431e2e62b18e9270ad2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36fc4fcd7a847f1139ceb8002de7b6ffd310bedf4d9ed431e2e62b18e9270ad2", kill_on_drop: false }`
[INFO] [stdout] 36fc4fcd7a847f1139ceb8002de7b6ffd310bedf4d9ed431e2e62b18e9270ad2
[INFO] checking chinedu360/rust_write_json against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchinedu360%2Frust_write_json" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/chinedu360/rust_write_json 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/chinedu360/rust_write_json
[INFO] finished tweaking git repo https://github.com/chinedu360/rust_write_json
[INFO] tweaked toml for git repo https://github.com/chinedu360/rust_write_json written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/chinedu360/rust_write_json 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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] a99c46d8a580662d0770589c89a814813d2efef0a3a93ceec197a618dd26eb4b
[INFO] running `Command { std: "docker" "start" "-a" "a99c46d8a580662d0770589c89a814813d2efef0a3a93ceec197a618dd26eb4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a99c46d8a580662d0770589c89a814813d2efef0a3a93ceec197a618dd26eb4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a99c46d8a580662d0770589c89a814813d2efef0a3a93ceec197a618dd26eb4b", kill_on_drop: false }`
[INFO] [stdout] a99c46d8a580662d0770589c89a814813d2efef0a3a93ceec197a618dd26eb4b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 69dfd3328d1ab1a09b636f732987506159f7574dc4cb2ff8de8a6f9bf6013a0e
[INFO] running `Command { std: "docker" "start" "-a" "69dfd3328d1ab1a09b636f732987506159f7574dc4cb2ff8de8a6f9bf6013a0e", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_json v1.0.105
[INFO] [stderr]     Checking rust_write_json v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.70s
[INFO] running `Command { std: "docker" "inspect" "69dfd3328d1ab1a09b636f732987506159f7574dc4cb2ff8de8a6f9bf6013a0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69dfd3328d1ab1a09b636f732987506159f7574dc4cb2ff8de8a6f9bf6013a0e", kill_on_drop: false }`
[INFO] [stdout] 69dfd3328d1ab1a09b636f732987506159f7574dc4cb2ff8de8a6f9bf6013a0e