[INFO] fetching crate runa-io-traits 0.0.1-alpha1...
[INFO] checking runa-io-traits-0.0.1-alpha1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate runa-io-traits 0.0.1-alpha1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate runa-io-traits 0.0.1-alpha1 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 crates.io crate runa-io-traits 0.0.1-alpha1
[INFO] finished tweaking crates.io crate runa-io-traits 0.0.1-alpha1
[INFO] tweaked toml for crates.io crate runa-io-traits 0.0.1-alpha1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 3 packages
[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] b03d0b4efd6b85a030e1c545feaf06a99a195c30169b654218061ae3ee00e618
[INFO] running `Command { std: "docker" "start" "-a" "b03d0b4efd6b85a030e1c545feaf06a99a195c30169b654218061ae3ee00e618", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b03d0b4efd6b85a030e1c545feaf06a99a195c30169b654218061ae3ee00e618", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b03d0b4efd6b85a030e1c545feaf06a99a195c30169b654218061ae3ee00e618", kill_on_drop: false }`
[INFO] [stdout] b03d0b4efd6b85a030e1c545feaf06a99a195c30169b654218061ae3ee00e618
[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] fcf882a281541a64dc11d104ae1d7f97ebf8ec898bb8207c08c56c35deb37814
[INFO] running `Command { std: "docker" "start" "-a" "fcf882a281541a64dc11d104ae1d7f97ebf8ec898bb8207c08c56c35deb37814", kill_on_drop: false }`
[INFO] [stderr]     Checking runa-io-traits v0.0.1-alpha1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Future` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:310:15
[INFO] [stdout]     |
[INFO] [stdout] 310 |     use std::{future::Future, io::Result, task::ready};
[INFO] [stdout]     |               ^^^^^^^^^^^^^^
[INFO] [stdout] 311 |
[INFO] [stdout] 312 |     use super::*;
[INFO] [stdout]     |         -------- the item `Future` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Result` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:310:31
[INFO] [stdout]     |
[INFO] [stdout] 310 |     use std::{future::Future, io::Result, task::ready};
[INFO] [stdout]     |                               ^^^^^^^^^^
[INFO] [stdout] 311 |
[INFO] [stdout] 312 |     use super::*;
[INFO] [stdout]     |         -------- the item `Result` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Future` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:310:15
[INFO] [stdout]     |
[INFO] [stdout] 310 |     use std::{future::Future, io::Result, task::ready};
[INFO] [stdout]     |               ^^^^^^^^^^^^^^
[INFO] [stdout] 311 |
[INFO] [stdout] 312 |     use super::*;
[INFO] [stdout]     |         -------- the item `Future` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Result` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:310:31
[INFO] [stdout]     |
[INFO] [stdout] 310 |     use std::{future::Future, io::Result, task::ready};
[INFO] [stdout]     |                               ^^^^^^^^^^
[INFO] [stdout] 311 |
[INFO] [stdout] 312 |     use super::*;
[INFO] [stdout]     |         -------- the item `Result` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.13s
[INFO] running `Command { std: "docker" "inspect" "fcf882a281541a64dc11d104ae1d7f97ebf8ec898bb8207c08c56c35deb37814", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fcf882a281541a64dc11d104ae1d7f97ebf8ec898bb8207c08c56c35deb37814", kill_on_drop: false }`
[INFO] [stdout] fcf882a281541a64dc11d104ae1d7f97ebf8ec898bb8207c08c56c35deb37814