[INFO] cloning repository https://github.com/linyihai/lyh-reactor-executor-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/linyihai/lyh-reactor-executor-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flinyihai%2Flyh-reactor-executor-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flinyihai%2Flyh-reactor-executor-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 50341f98d8d9af7603cbb6e1dd72efad6d843261
[INFO] checking linyihai/lyh-reactor-executor-example against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flinyihai%2Flyh-reactor-executor-example" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/linyihai/lyh-reactor-executor-example 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/linyihai/lyh-reactor-executor-example
[INFO] finished tweaking git repo https://github.com/linyihai/lyh-reactor-executor-example
[INFO] tweaked toml for git repo https://github.com/linyihai/lyh-reactor-executor-example written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/linyihai/lyh-reactor-executor-example 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 349241e5a29b52c9895ebe06c871e9303d79ef7ed815c29f2ac6ed1b7e27b4d9
[INFO] running `Command { std: "docker" "start" "-a" "349241e5a29b52c9895ebe06c871e9303d79ef7ed815c29f2ac6ed1b7e27b4d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "349241e5a29b52c9895ebe06c871e9303d79ef7ed815c29f2ac6ed1b7e27b4d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "349241e5a29b52c9895ebe06c871e9303d79ef7ed815c29f2ac6ed1b7e27b4d9", kill_on_drop: false }`
[INFO] [stdout] 349241e5a29b52c9895ebe06c871e9303d79ef7ed815c29f2ac6ed1b7e27b4d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 52a5bf958e6c1d2965384294d3dcbce5dc8a8190a3dd07894cb0ed047fb501b4
[INFO] running `Command { std: "docker" "start" "-a" "52a5bf958e6c1d2965384294d3dcbce5dc8a8190a3dd07894cb0ed047fb501b4", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.107
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking lyh-reactor-executor-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/poll.rs:13:9
[INFO] [stdout]     |
[INFO] [stdout] 13  | /         if res == -1 {
[INFO] [stdout] 14  | |             Err(std::io::Error::last_os_error())
[INFO] [stdout] 15  | |         } else {
[INFO] [stdout] 16  | |             Ok(res)
[INFO] [stdout] 17  | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] ...
[INFO] [stdout] 140 |           syscall!(close(fd));
[INFO] [stdout]     |           ------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `syscall` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 13  ~         let _ = if res == -1 {
[INFO] [stdout] 14  |             Err(std::io::Error::last_os_error())
[INFO] [stdout] 15  |         } else {
[INFO] [stdout] 16  |             Ok(res)
[INFO] [stdout] 17  ~         };
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/poll.rs:13:9
[INFO] [stdout]     |
[INFO] [stdout] 13  | /         if res == -1 {
[INFO] [stdout] 14  | |             Err(std::io::Error::last_os_error())
[INFO] [stdout] 15  | |         } else {
[INFO] [stdout] 16  | |             Ok(res)
[INFO] [stdout] 17  | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] ...
[INFO] [stdout] 140 |           syscall!(close(fd));
[INFO] [stdout]     |           ------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `syscall` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 13  ~         let _ = if res == -1 {
[INFO] [stdout] 14  |             Err(std::io::Error::last_os_error())
[INFO] [stdout] 15  |         } else {
[INFO] [stdout] 16  |             Ok(res)
[INFO] [stdout] 17  ~         };
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.61s
[INFO] running `Command { std: "docker" "inspect" "52a5bf958e6c1d2965384294d3dcbce5dc8a8190a3dd07894cb0ed047fb501b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52a5bf958e6c1d2965384294d3dcbce5dc8a8190a3dd07894cb0ed047fb501b4", kill_on_drop: false }`
[INFO] [stdout] 52a5bf958e6c1d2965384294d3dcbce5dc8a8190a3dd07894cb0ed047fb501b4
[INFO] checking linyihai/lyh-reactor-executor-example against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flinyihai%2Flyh-reactor-executor-example" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/linyihai/lyh-reactor-executor-example on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/linyihai/lyh-reactor-executor-example
[INFO] finished tweaking git repo https://github.com/linyihai/lyh-reactor-executor-example
[INFO] tweaked toml for git repo https://github.com/linyihai/lyh-reactor-executor-example written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/linyihai/lyh-reactor-executor-example 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 08333fe7046710626e5a59a11758a7bb88ab05fbd31334bb3ce70d0df840b790
[INFO] running `Command { std: "docker" "start" "-a" "08333fe7046710626e5a59a11758a7bb88ab05fbd31334bb3ce70d0df840b790", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "08333fe7046710626e5a59a11758a7bb88ab05fbd31334bb3ce70d0df840b790", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08333fe7046710626e5a59a11758a7bb88ab05fbd31334bb3ce70d0df840b790", kill_on_drop: false }`
[INFO] [stdout] 08333fe7046710626e5a59a11758a7bb88ab05fbd31334bb3ce70d0df840b790
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 70dd7cc71fcf1fc03fabaf383506f3f6c9ae5df5afa5a4ed95ebb6b874c5f9ec
[INFO] running `Command { std: "docker" "start" "-a" "70dd7cc71fcf1fc03fabaf383506f3f6c9ae5df5afa5a4ed95ebb6b874c5f9ec", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.107
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking lyh-reactor-executor-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/poll.rs:13:9
[INFO] [stdout]     |
[INFO] [stdout] 13  | /         if res == -1 {
[INFO] [stdout] 14  | |             Err(std::io::Error::last_os_error())
[INFO] [stdout] 15  | |         } else {
[INFO] [stdout] 16  | |             Ok(res)
[INFO] [stdout] 17  | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] ...
[INFO] [stdout] 140 |           syscall!(close(fd));
[INFO] [stdout]     |           ------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `syscall` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 13  ~         let _ = if res == -1 {
[INFO] [stdout] 14  |             Err(std::io::Error::last_os_error())
[INFO] [stdout] 15  |         } else {
[INFO] [stdout] 16  |             Ok(res)
[INFO] [stdout] 17  ~         };
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/poll.rs:13:9
[INFO] [stdout]     |
[INFO] [stdout] 13  | /         if res == -1 {
[INFO] [stdout] 14  | |             Err(std::io::Error::last_os_error())
[INFO] [stdout] 15  | |         } else {
[INFO] [stdout] 16  | |             Ok(res)
[INFO] [stdout] 17  | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] ...
[INFO] [stdout] 140 |           syscall!(close(fd));
[INFO] [stdout]     |           ------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `syscall` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 13  ~         let _ = if res == -1 {
[INFO] [stdout] 14  |             Err(std::io::Error::last_os_error())
[INFO] [stdout] 15  |         } else {
[INFO] [stdout] 16  |             Ok(res)
[INFO] [stdout] 17  ~         };
[INFO] [stdout]     |
[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 2.54s
[INFO] running `Command { std: "docker" "inspect" "70dd7cc71fcf1fc03fabaf383506f3f6c9ae5df5afa5a4ed95ebb6b874c5f9ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70dd7cc71fcf1fc03fabaf383506f3f6c9ae5df5afa5a4ed95ebb6b874c5f9ec", kill_on_drop: false }`
[INFO] [stdout] 70dd7cc71fcf1fc03fabaf383506f3f6c9ae5df5afa5a4ed95ebb6b874c5f9ec