[INFO] fetching crate jsonit 0.2.2...
[INFO] checking jsonit-0.2.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate jsonit 0.2.2 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate jsonit 0.2.2 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 jsonit 0.2.2
[INFO] finished tweaking crates.io crate jsonit 0.2.2
[INFO] tweaked toml for crates.io crate jsonit 0.2.2 written to /workspace/builds/worker-0-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]     Updating crates.io index
[INFO] [stderr]      Locking 49 packages
[INFO] [stderr]       Adding colored v1.9.4 (latest: v2.1.0)
[INFO] [stderr]       Adding windows-core v0.52.0 (latest: v0.55.0)
[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-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] ab16595c4a3e23fbe1dbdecb6b546a1c205076a312460b445ca2231e58c884c7
[INFO] running `Command { std: "docker" "start" "-a" "ab16595c4a3e23fbe1dbdecb6b546a1c205076a312460b445ca2231e58c884c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab16595c4a3e23fbe1dbdecb6b546a1c205076a312460b445ca2231e58c884c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab16595c4a3e23fbe1dbdecb6b546a1c205076a312460b445ca2231e58c884c7", kill_on_drop: false }`
[INFO] [stdout] ab16595c4a3e23fbe1dbdecb6b546a1c205076a312460b445ca2231e58c884c7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] aeb283e0bf81caa402dbda11aad6032570f68e47ee7dd17e26dbc5d3ba4b2f9e
[INFO] running `Command { std: "docker" "start" "-a" "aeb283e0bf81caa402dbda11aad6032570f68e47ee7dd17e26dbc5d3ba4b2f9e", kill_on_drop: false }`
[INFO] [stderr]     Checking is-terminal v0.4.12
[INFO] [stderr]     Checking chrono v0.4.37
[INFO] [stderr]     Checking serde v1.0.197
[INFO] [stderr]     Checking colored v1.9.4
[INFO] [stderr]     Checking fern v0.6.2
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Checking jsonit v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]  --> tests/tests.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::ops::Deref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `b` is never read
[INFO] [stdout]    --> tests/tests.rs:152:4
[INFO] [stdout]     |
[INFO] [stdout] 151 |         struct S {
[INFO] [stdout]     |                - field in this struct
[INFO] [stdout] 152 |             b: i32,
[INFO] [stdout]     |             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `S` 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.13s
[INFO] running `Command { std: "docker" "inspect" "aeb283e0bf81caa402dbda11aad6032570f68e47ee7dd17e26dbc5d3ba4b2f9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aeb283e0bf81caa402dbda11aad6032570f68e47ee7dd17e26dbc5d3ba4b2f9e", kill_on_drop: false }`
[INFO] [stdout] aeb283e0bf81caa402dbda11aad6032570f68e47ee7dd17e26dbc5d3ba4b2f9e