[INFO] fetching crate arangors 0.5.4...
[INFO] checking arangors-0.5.4 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate arangors 0.5.4 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate arangors 0.5.4 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 crates.io crate arangors 0.5.4
[INFO] finished tweaking crates.io crate arangors 0.5.4
[INFO] tweaked toml for crates.io crate arangors 0.5.4 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate arangors 0.5.4 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 }`
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[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 144a9f82b796371b49b94f836631ded3401d7b1fc9290ac170b25a251fdd1480
[INFO] running `Command { std: "docker" "start" "-a" "144a9f82b796371b49b94f836631ded3401d7b1fc9290ac170b25a251fdd1480", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "144a9f82b796371b49b94f836631ded3401d7b1fc9290ac170b25a251fdd1480", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "144a9f82b796371b49b94f836631ded3401d7b1fc9290ac170b25a251fdd1480", kill_on_drop: false }`
[INFO] [stdout] 144a9f82b796371b49b94f836631ded3401d7b1fc9290ac170b25a251fdd1480
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0d62d55da1b97b30bfa391f74c523756e0e1ecc641a1143206e122d6c6306824
[INFO] running `Command { std: "docker" "start" "-a" "0d62d55da1b97b30bfa391f74c523756e0e1ecc641a1143206e122d6c6306824", kill_on_drop: false }`
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[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/collection/mod.rs:5:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::{convert::TryFrom, sync::Arc};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `TryFrom` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/collection/mod.rs:5:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::{convert::TryFrom, sync::Arc};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `TryFrom` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id`, `name`, `status`, `type`, and `is_system` are never read
[INFO] [stdout]    --> src/response.rs:116:13
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub struct CollectionResponse {
[INFO] [stdout]     |                ------------------ fields in this struct
[INFO] [stdout] 116 |         pub id: String,
[INFO] [stdout]     |             ^^
[INFO] [stdout] 117 |         pub name: String,
[INFO] [stdout]     |             ^^^^
[INFO] [stdout] 118 |         pub status: u8,
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout] 119 |         pub r#type: u8,
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout] 120 |         #[serde(rename = "isSystem")]
[INFO] [stdout] 121 |         pub is_system: bool,
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `CollectionResponse` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings 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 12.59s
[INFO] running `Command { std: "docker" "inspect" "0d62d55da1b97b30bfa391f74c523756e0e1ecc641a1143206e122d6c6306824", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d62d55da1b97b30bfa391f74c523756e0e1ecc641a1143206e122d6c6306824", kill_on_drop: false }`
[INFO] [stdout] 0d62d55da1b97b30bfa391f74c523756e0e1ecc641a1143206e122d6c6306824