[INFO] cloning repository https://github.com/fengzhyuan/webserver_demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fengzhyuan/webserver_demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffengzhyuan%2Fwebserver_demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffengzhyuan%2Fwebserver_demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c54f3eb4b8dca7abacefe8f1c512da3ab640051f
[INFO] checking fengzhyuan/webserver_demo against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffengzhyuan%2Fwebserver_demo" "/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/fengzhyuan/webserver_demo 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/fengzhyuan/webserver_demo
[INFO] finished tweaking git repo https://github.com/fengzhyuan/webserver_demo
[INFO] tweaked toml for git repo https://github.com/fengzhyuan/webserver_demo written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/fengzhyuan/webserver_demo 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]  Downloading crates ...
[INFO] [stderr]   Downloaded ctrlc v3.2.1
[INFO] [stderr]   Downloaded libc v0.2.119
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 47dc7706364715ad10aaae00508c1e7bce3f8c4de886905b340b0feb52a96129
[INFO] running `Command { std: "docker" "start" "-a" "47dc7706364715ad10aaae00508c1e7bce3f8c4de886905b340b0feb52a96129", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47dc7706364715ad10aaae00508c1e7bce3f8c4de886905b340b0feb52a96129", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47dc7706364715ad10aaae00508c1e7bce3f8c4de886905b340b0feb52a96129", kill_on_drop: false }`
[INFO] [stdout] 47dc7706364715ad10aaae00508c1e7bce3f8c4de886905b340b0feb52a96129
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 547bcacac41a28ffcd6a705ce44c4c1eba29e5113483418a2bd0972d3afb5ac5
[INFO] running `Command { std: "docker" "start" "-a" "547bcacac41a28ffcd6a705ce44c4c1eba29e5113483418a2bd0972d3afb5ac5", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.119
[INFO] [stderr]     Checking nix v0.23.1
[INFO] [stderr]     Checking ctrlc v3.2.1
[INFO] [stderr]     Checking webserver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/bin/main.rs:105:9
[INFO] [stdout]     |
[INFO] [stdout] 105 |         drop(&self.threadpool);
[INFO] [stdout]     |         ^^^^^----------------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&ThreadPool`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/bin/main.rs:105:9
[INFO] [stdout]     |
[INFO] [stdout] 105 |         drop(&self.threadpool);
[INFO] [stdout]     |         ^^^^^----------------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&ThreadPool`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     = note: `#[warn(dropping_references)]` 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 2.81s
[INFO] running `Command { std: "docker" "inspect" "547bcacac41a28ffcd6a705ce44c4c1eba29e5113483418a2bd0972d3afb5ac5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "547bcacac41a28ffcd6a705ce44c4c1eba29e5113483418a2bd0972d3afb5ac5", kill_on_drop: false }`
[INFO] [stdout] 547bcacac41a28ffcd6a705ce44c4c1eba29e5113483418a2bd0972d3afb5ac5
[INFO] checking fengzhyuan/webserver_demo against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffengzhyuan%2Fwebserver_demo" "/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/fengzhyuan/webserver_demo 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/fengzhyuan/webserver_demo
[INFO] finished tweaking git repo https://github.com/fengzhyuan/webserver_demo
[INFO] tweaked toml for git repo https://github.com/fengzhyuan/webserver_demo written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/fengzhyuan/webserver_demo 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-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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 54ded0db5b52993bd0f289375cd90229d24c05e0c78f1b4e60b9811e9acf3053
[INFO] running `Command { std: "docker" "start" "-a" "54ded0db5b52993bd0f289375cd90229d24c05e0c78f1b4e60b9811e9acf3053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "54ded0db5b52993bd0f289375cd90229d24c05e0c78f1b4e60b9811e9acf3053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54ded0db5b52993bd0f289375cd90229d24c05e0c78f1b4e60b9811e9acf3053", kill_on_drop: false }`
[INFO] [stdout] 54ded0db5b52993bd0f289375cd90229d24c05e0c78f1b4e60b9811e9acf3053
[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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1fa12b4db9bf4ff87f5bb870b9da9942044b372ae1dba3a88a8efb114b37eebc
[INFO] running `Command { std: "docker" "start" "-a" "1fa12b4db9bf4ff87f5bb870b9da9942044b372ae1dba3a88a8efb114b37eebc", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.119
[INFO] [stderr]     Checking nix v0.23.1
[INFO] [stderr]     Checking ctrlc v3.2.1
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/ctrlc-3.2.1/src/lib.rs:108:16
[INFO] [stdout]     |
[INFO] [stdout] 108 |         .spawn(move || loop {
[INFO] [stdout]     |          ----- ^^^^^^^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          type must be known at this point
[INFO] [stdout]     |
[INFO] [stdout]     = note: cannot satisfy `_: Send`
[INFO] [stdout] note: required by a bound in `Builder::spawn`
[INFO] [stdout]    --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/thread/mod.rs:381:5
[INFO] [stdout] help: try giving this closure an explicit return type
[INFO] [stdout]     |
[INFO] [stdout] 108 ~         .spawn(move || -> /* Type */ { loop {
[INFO] [stdout] 109 |             unsafe {
[INFO] [stdout]   ...
[INFO] [stdout] 112 |             user_handler();
[INFO] [stdout] 113 ~         } })
[INFO] [stdout]     |
[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 E0283`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ctrlc` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "1fa12b4db9bf4ff87f5bb870b9da9942044b372ae1dba3a88a8efb114b37eebc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fa12b4db9bf4ff87f5bb870b9da9942044b372ae1dba3a88a8efb114b37eebc", kill_on_drop: false }`
[INFO] [stdout] 1fa12b4db9bf4ff87f5bb870b9da9942044b372ae1dba3a88a8efb114b37eebc