[INFO] fetching crate netoptim-rs 0.1.0...
[INFO] checking netoptim-rs-0.1.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate netoptim-rs 0.1.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate netoptim-rs 0.1.0 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 netoptim-rs 0.1.0
[INFO] finished tweaking crates.io crate netoptim-rs 0.1.0
[INFO] tweaked toml for crates.io crate netoptim-rs 0.1.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate netoptim-rs 0.1.0 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] d4c162833802884a7afd299a76fd0c849d1b5ac9ddba0ee692d1d1a3c353db97
[INFO] running `Command { std: "docker" "start" "-a" "d4c162833802884a7afd299a76fd0c849d1b5ac9ddba0ee692d1d1a3c353db97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d4c162833802884a7afd299a76fd0c849d1b5ac9ddba0ee692d1d1a3c353db97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4c162833802884a7afd299a76fd0c849d1b5ac9ddba0ee692d1d1a3c353db97", kill_on_drop: false }`
[INFO] [stdout] d4c162833802884a7afd299a76fd0c849d1b5ac9ddba0ee692d1d1a3c353db97
[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] 6ef6987739304a33eba4b2e39d7e644eae6829cd62f5e0afe097d868e6418597
[INFO] running `Command { std: "docker" "start" "-a" "6ef6987739304a33eba4b2e39d7e644eae6829cd62f5e0afe097d868e6418597", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling serde v1.0.180
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling serde_json v1.0.104
[INFO] [stderr]     Checking fixedbitset v0.4.2
[INFO] [stderr]    Compiling serde_derive v1.0.180
[INFO] [stderr]     Checking num-complex v0.4.3
[INFO] [stderr]     Checking num v0.4.1
[INFO] [stderr]     Checking petgraph v0.6.3
[INFO] [stderr]     Checking netoptim-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `NodeIndex` is imported redundantly
[INFO] [stdout]  --> src/neg_cycle.rs:1:38
[INFO] [stdout]   |
[INFO] [stdout] 1 | use petgraph::graph::{EdgeReference, NodeIndex};
[INFO] [stdout]   |                                      ^^^^^^^^^
[INFO] [stdout] 2 | use petgraph::prelude::*;
[INFO] [stdout]   |     -------------------- the item `NodeIndex` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `EdgeRef` is imported redundantly
[INFO] [stdout]  --> src/neg_cycle.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use petgraph::prelude::*;
[INFO] [stdout]   |     -------------------- the item `EdgeRef` is already imported here
[INFO] [stdout] 3 | use petgraph::visit::EdgeRef;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `NodeIndex` is imported redundantly
[INFO] [stdout]  --> src/neg_cycle.rs:1:38
[INFO] [stdout]   |
[INFO] [stdout] 1 | use petgraph::graph::{EdgeReference, NodeIndex};
[INFO] [stdout]   |                                      ^^^^^^^^^
[INFO] [stdout] 2 | use petgraph::prelude::*;
[INFO] [stdout]   |     -------------------- the item `NodeIndex` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `EdgeRef` is imported redundantly
[INFO] [stdout]  --> src/neg_cycle.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use petgraph::prelude::*;
[INFO] [stdout]   |     -------------------- the item `EdgeRef` is already imported here
[INFO] [stdout] 3 | use petgraph::visit::EdgeRef;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[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] [stdout] warning: the item `Graph` is imported redundantly
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use petgraph::prelude::*;
[INFO] [stdout]   |     -------------------- the item `Graph` is already imported here
[INFO] [stdout] 3 | use petgraph::Graph;
[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: the item `Graph` is imported redundantly
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use petgraph::prelude::*;
[INFO] [stdout]   |     -------------------- the item `Graph` is already imported here
[INFO] [stdout] 3 | use petgraph::Graph;
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.41s
[INFO] running `Command { std: "docker" "inspect" "6ef6987739304a33eba4b2e39d7e644eae6829cd62f5e0afe097d868e6418597", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ef6987739304a33eba4b2e39d7e644eae6829cd62f5e0afe097d868e6418597", kill_on_drop: false }`
[INFO] [stdout] 6ef6987739304a33eba4b2e39d7e644eae6829cd62f5e0afe097d868e6418597