[INFO] cloning repository https://github.com/xlmnxp/u2t
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xlmnxp/u2t" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxlmnxp%2Fu2t", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxlmnxp%2Fu2t'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a732f2f4b57c828dea060e71e2b2f000e3569e52
[INFO] checking xlmnxp/u2t against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxlmnxp%2Fu2t" "/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/xlmnxp/u2t 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/xlmnxp/u2t
[INFO] finished tweaking git repo https://github.com/xlmnxp/u2t
[INFO] tweaked toml for git repo https://github.com/xlmnxp/u2t written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/xlmnxp/u2t 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-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dcd10fc30683a6ef09c001f4ae79ed134a7c3d81294dcbc6c0a4521bdec909b2
[INFO] running `Command { std: "docker" "start" "-a" "dcd10fc30683a6ef09c001f4ae79ed134a7c3d81294dcbc6c0a4521bdec909b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dcd10fc30683a6ef09c001f4ae79ed134a7c3d81294dcbc6c0a4521bdec909b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dcd10fc30683a6ef09c001f4ae79ed134a7c3d81294dcbc6c0a4521bdec909b2", kill_on_drop: false }`
[INFO] [stdout] dcd10fc30683a6ef09c001f4ae79ed134a7c3d81294dcbc6c0a4521bdec909b2
[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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6d229e869721ada240e21f2b115f1ebff0291881611b22f644375d5772bc30f6
[INFO] running `Command { std: "docker" "start" "-a" "6d229e869721ada240e21f2b115f1ebff0291881611b22f644375d5772bc30f6", kill_on_drop: false }`
[INFO] [stderr]     Checking u2t v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `TcpListener`
[INFO] [stdout]  --> src/bin/client.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::net::{TcpListener, TcpStream, UdpSocket};
[INFO] [stdout]   |                ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TcpListener`
[INFO] [stdout]  --> src/bin/client.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::net::{TcpListener, TcpStream, UdpSocket};
[INFO] [stdout]   |                ^^^^^^^^^^^
[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 0.18s
[INFO] running `Command { std: "docker" "inspect" "6d229e869721ada240e21f2b115f1ebff0291881611b22f644375d5772bc30f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d229e869721ada240e21f2b115f1ebff0291881611b22f644375d5772bc30f6", kill_on_drop: false }`
[INFO] [stdout] 6d229e869721ada240e21f2b115f1ebff0291881611b22f644375d5772bc30f6
[INFO] checking xlmnxp/u2t against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxlmnxp%2Fu2t" "/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/xlmnxp/u2t 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/xlmnxp/u2t
[INFO] finished tweaking git repo https://github.com/xlmnxp/u2t
[INFO] tweaked toml for git repo https://github.com/xlmnxp/u2t written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/xlmnxp/u2t 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 59821ed6709222d265b1a0aceceb64e81184adc6f82a36566b10ba62539c6775
[INFO] running `Command { std: "docker" "start" "-a" "59821ed6709222d265b1a0aceceb64e81184adc6f82a36566b10ba62539c6775", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "59821ed6709222d265b1a0aceceb64e81184adc6f82a36566b10ba62539c6775", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59821ed6709222d265b1a0aceceb64e81184adc6f82a36566b10ba62539c6775", kill_on_drop: false }`
[INFO] [stdout] 59821ed6709222d265b1a0aceceb64e81184adc6f82a36566b10ba62539c6775
[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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4b2af5f32b14afc7a886058cf2487a0f498ae54b81a97aef83d5eaca7e61310
[INFO] running `Command { std: "docker" "start" "-a" "e4b2af5f32b14afc7a886058cf2487a0f498ae54b81a97aef83d5eaca7e61310", kill_on_drop: false }`
[INFO] [stderr]     Checking u2t v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `TcpListener`
[INFO] [stdout]  --> src/bin/client.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::net::{TcpListener, TcpStream, UdpSocket};
[INFO] [stdout]   |                ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TcpListener`
[INFO] [stdout]  --> src/bin/client.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::net::{TcpListener, TcpStream, UdpSocket};
[INFO] [stdout]   |                ^^^^^^^^^^^
[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 0.19s
[INFO] running `Command { std: "docker" "inspect" "e4b2af5f32b14afc7a886058cf2487a0f498ae54b81a97aef83d5eaca7e61310", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4b2af5f32b14afc7a886058cf2487a0f498ae54b81a97aef83d5eaca7e61310", kill_on_drop: false }`
[INFO] [stdout] e4b2af5f32b14afc7a886058cf2487a0f498ae54b81a97aef83d5eaca7e61310