[INFO] fetching crate frust 0.0.7...
[INFO] checking frust-0.0.7 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate frust 0.0.7 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate frust 0.0.7 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 frust 0.0.7
[INFO] finished tweaking crates.io crate frust 0.0.7
[INFO] tweaked toml for crates.io crate frust 0.0.7 written to /workspace/builds/worker-5-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] 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] 7aac89fac5cbff2d5906995f65cc00ef41df49e7aaeaac87ed46612eea3f929c
[INFO] running `Command { std: "docker" "start" "-a" "7aac89fac5cbff2d5906995f65cc00ef41df49e7aaeaac87ed46612eea3f929c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7aac89fac5cbff2d5906995f65cc00ef41df49e7aaeaac87ed46612eea3f929c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7aac89fac5cbff2d5906995f65cc00ef41df49e7aaeaac87ed46612eea3f929c", kill_on_drop: false }`
[INFO] [stdout] 7aac89fac5cbff2d5906995f65cc00ef41df49e7aaeaac87ed46612eea3f929c
[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] 135729eeddaab4bc7e5a051284e552d7754a25d882bc94b8946be47bc0976a56
[INFO] running `Command { std: "docker" "start" "-a" "135729eeddaab4bc7e5a051284e552d7754a25d882bc94b8946be47bc0976a56", kill_on_drop: false }`
[INFO] [stderr]     Checking frust v0.0.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]    --> src/semigroup.rs:313:9
[INFO] [stdout]     |
[INFO] [stdout] 313 |     use std::collections::*;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::*`
[INFO] [stdout]    --> src/semigroup.rs:314:9
[INFO] [stdout]     |
[INFO] [stdout] 314 |     use std::cell::*;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Product` is imported redundantly
[INFO] [stdout]    --> src/monoid.rs:225:35
[INFO] [stdout]     |
[INFO] [stdout] 224 |     use super::*;
[INFO] [stdout]     |         -------- the item `Product` is already imported here
[INFO] [stdout] 225 |     use super::super::semigroup::{Product, All, Any};
[INFO] [stdout]     |                                   ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `All` is imported redundantly
[INFO] [stdout]    --> src/monoid.rs:225:44
[INFO] [stdout]     |
[INFO] [stdout] 224 |     use super::*;
[INFO] [stdout]     |         -------- the item `All` is already imported here
[INFO] [stdout] 225 |     use super::super::semigroup::{Product, All, Any};
[INFO] [stdout]     |                                            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Any` is imported redundantly
[INFO] [stdout]    --> src/monoid.rs:225:49
[INFO] [stdout]     |
[INFO] [stdout] 224 |     use super::*;
[INFO] [stdout]     |         -------- the item `Any` is already imported here
[INFO] [stdout] 225 |     use super::super::semigroup::{Product, All, Any};
[INFO] [stdout]     |                                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]    --> src/monoid.rs:226:9
[INFO] [stdout]     |
[INFO] [stdout] 226 |     use std::collections::*;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.53s
[INFO] running `Command { std: "docker" "inspect" "135729eeddaab4bc7e5a051284e552d7754a25d882bc94b8946be47bc0976a56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "135729eeddaab4bc7e5a051284e552d7754a25d882bc94b8946be47bc0976a56", kill_on_drop: false }`
[INFO] [stdout] 135729eeddaab4bc7e5a051284e552d7754a25d882bc94b8946be47bc0976a56