[INFO] cloning repository https://github.com/CoolOppo/bren
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CoolOppo/bren" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCoolOppo%2Fbren", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCoolOppo%2Fbren'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 76c53972cd7385328658c50f314b02c8c6947d21
[INFO] checking CoolOppo/bren against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCoolOppo%2Fbren" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CoolOppo/bren 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/CoolOppo/bren
[INFO] finished tweaking git repo https://github.com/CoolOppo/bren
[INFO] tweaked toml for git repo https://github.com/CoolOppo/bren written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/CoolOppo/bren 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded remove_dir_all v0.5.1
[INFO] [stderr]   Downloaded nodrop v0.1.13
[INFO] [stderr]   Downloaded crossbeam-utils v0.2.2
[INFO] [stderr]   Downloaded crossbeam-deque v0.2.0
[INFO] [stderr]   Downloaded num_cpus v1.10.0
[INFO] [stderr]   Downloaded walkdir v2.2.7
[INFO] [stderr]   Downloaded crossbeam-deque v0.7.1
[INFO] [stderr]   Downloaded crossbeam-epoch v0.7.1
[INFO] [stderr]   Downloaded crossbeam-channel v0.3.8
[INFO] [stderr]   Downloaded regex-syntax v0.6.6
[INFO] [stderr]   Downloaded regex v1.1.6
[INFO] [stderr]   Downloaded libc v0.2.54
[INFO] [stderr]   Downloaded ignore v0.4.7
[INFO] [stderr]   Downloaded crossbeam-utils v0.6.5
[INFO] [stderr]   Downloaded same-file v1.0.4
[INFO] [stderr]   Downloaded parking_lot v0.8.0
[INFO] [stderr]   Downloaded arrayvec v0.4.10
[INFO] [stderr]   Downloaded crossbeam-epoch v0.3.1
[INFO] [stderr]   Downloaded rayon v1.0.3
[INFO] [stderr]   Downloaded crossbeam v0.7.1
[INFO] [stderr]   Downloaded globset v0.4.3
[INFO] [stderr]   Downloaded utf8-ranges v1.0.2
[INFO] [stderr]   Downloaded lock_api v0.2.0
[INFO] [stderr]   Downloaded parking_lot_core v0.5.0
[INFO] [stderr]   Downloaded either v1.5.2
[INFO] [stderr]   Downloaded rayon-core v1.4.1
[INFO] [stderr]   Downloaded tempfile v3.0.7
[INFO] [stderr]   Downloaded bstr v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 4f99510b8543b5bbbcbe6023dcd6871940078b0a8160bd78e444b7efb5fb1387
[INFO] running `Command { std: "docker" "start" "-a" "4f99510b8543b5bbbcbe6023dcd6871940078b0a8160bd78e444b7efb5fb1387", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4f99510b8543b5bbbcbe6023dcd6871940078b0a8160bd78e444b7efb5fb1387", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f99510b8543b5bbbcbe6023dcd6871940078b0a8160bd78e444b7efb5fb1387", kill_on_drop: false }`
[INFO] [stdout] 4f99510b8543b5bbbcbe6023dcd6871940078b0a8160bd78e444b7efb5fb1387
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 22180a1a47e1dd633119634038468802f6188ab1ebb82aa2a0fc895a91276dab
[INFO] running `Command { std: "docker" "start" "-a" "22180a1a47e1dd633119634038468802f6188ab1ebb82aa2a0fc895a91276dab", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]    Compiling libc v0.2.54
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]     Checking smallvec v0.6.9
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking crossbeam-utils v0.6.5
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]    Compiling regex v1.1.6
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]     Checking regex-syntax v0.6.6
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]     Checking crossbeam-channel v0.3.8
[INFO] [stderr]    Compiling parking_lot v0.8.0
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking same-file v1.0.4
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking num_cpus v1.10.0
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]     Checking aho-corasick v0.7.3
[INFO] [stderr]     Checking bstr v0.1.3
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-epoch v0.7.1
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking walkdir v2.2.7
[INFO] [stderr]     Checking lock_api v0.2.0
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking remove_dir_all v0.5.1
[INFO] [stderr]     Checking crossbeam v0.7.1
[INFO] [stderr]     Checking tempfile v3.0.7
[INFO] [stderr]     Checking globset v0.4.3
[INFO] [stderr]     Checking ignore v0.4.7
[INFO] [stderr]     Checking bren v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/main.rs:6:28
[INFO] [stdout]   |
[INFO] [stdout] 6 |     io::{self, prelude::*, Write},
[INFO] [stdout]   |                ----------  ^^^^^
[INFO] [stdout]   |                |
[INFO] [stdout]   |                the item `Write` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/main.rs:6:28
[INFO] [stdout]   |
[INFO] [stdout] 6 |     io::{self, prelude::*, Write},
[INFO] [stdout]   |                ----------  ^^^^^
[INFO] [stdout]   |                |
[INFO] [stdout]   |                the item `Write` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.02s
[INFO] running `Command { std: "docker" "inspect" "22180a1a47e1dd633119634038468802f6188ab1ebb82aa2a0fc895a91276dab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22180a1a47e1dd633119634038468802f6188ab1ebb82aa2a0fc895a91276dab", kill_on_drop: false }`
[INFO] [stdout] 22180a1a47e1dd633119634038468802f6188ab1ebb82aa2a0fc895a91276dab
[INFO] checking CoolOppo/bren against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCoolOppo%2Fbren" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CoolOppo/bren 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/CoolOppo/bren
[INFO] finished tweaking git repo https://github.com/CoolOppo/bren
[INFO] tweaked toml for git repo https://github.com/CoolOppo/bren written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/CoolOppo/bren 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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 40dfc255896415bb3481db5472048b7a2abf4628c32894f6580cfb56fed4704b
[INFO] running `Command { std: "docker" "start" "-a" "40dfc255896415bb3481db5472048b7a2abf4628c32894f6580cfb56fed4704b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "40dfc255896415bb3481db5472048b7a2abf4628c32894f6580cfb56fed4704b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40dfc255896415bb3481db5472048b7a2abf4628c32894f6580cfb56fed4704b", kill_on_drop: false }`
[INFO] [stdout] 40dfc255896415bb3481db5472048b7a2abf4628c32894f6580cfb56fed4704b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 299b498d310f571c25ea55c2e07320c2e7b0885caafa555b756b9014c1771c33
[INFO] running `Command { std: "docker" "start" "-a" "299b498d310f571c25ea55c2e07320c2e7b0885caafa555b756b9014c1771c33", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]    Compiling libc v0.2.54
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]     Checking smallvec v0.6.9
[INFO] [stderr]     Checking crossbeam-utils v0.6.5
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.6
[INFO] [stderr]     Checking regex-syntax v0.6.6
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]     Checking crossbeam-channel v0.3.8
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]    Compiling parking_lot v0.8.0
[INFO] [stderr]     Checking same-file v1.0.4
[INFO] [stderr]     Checking aho-corasick v0.7.3
[INFO] [stderr]     Checking bstr v0.1.3
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-epoch v0.7.1
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking num_cpus v1.10.0
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking lock_api v0.2.0
[INFO] [stderr]     Checking walkdir v2.2.7
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking remove_dir_all v0.5.1
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking crossbeam v0.7.1
[INFO] [stderr]     Checking tempfile v3.0.7
[INFO] [stderr]     Checking globset v0.4.3
[INFO] [stderr]     Checking ignore v0.4.7
[INFO] [stderr]     Checking bren v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/main.rs:6:28
[INFO] [stdout]   |
[INFO] [stdout] 6 |     io::{self, prelude::*, Write},
[INFO] [stdout]   |                ----------  ^^^^^
[INFO] [stdout]   |                |
[INFO] [stdout]   |                the item `Write` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/main.rs:6:28
[INFO] [stdout]   |
[INFO] [stdout] 6 |     io::{self, prelude::*, Write},
[INFO] [stdout]   |                ----------  ^^^^^
[INFO] [stdout]   |                |
[INFO] [stdout]   |                the item `Write` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.43s
[INFO] running `Command { std: "docker" "inspect" "299b498d310f571c25ea55c2e07320c2e7b0885caafa555b756b9014c1771c33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "299b498d310f571c25ea55c2e07320c2e7b0885caafa555b756b9014c1771c33", kill_on_drop: false }`
[INFO] [stdout] 299b498d310f571c25ea55c2e07320c2e7b0885caafa555b756b9014c1771c33