[INFO] cloning repository https://github.com/hangleang/halo2-examples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hangleang/halo2-examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhangleang%2Fhalo2-examples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhangleang%2Fhalo2-examples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7fd0a17e8a936e958fcffd443b88cd7d5976e25b
[INFO] checking hangleang/halo2-examples against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhangleang%2Fhalo2-examples" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hangleang/halo2-examples on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hangleang/halo2-examples
[INFO] finished tweaking git repo https://github.com/hangleang/halo2-examples
[INFO] tweaked toml for git repo https://github.com/hangleang/halo2-examples written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/hangleang/halo2-examples 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pasta_curves v0.4.1
[INFO] [stderr]   Downloaded freetype v0.7.2
[INFO] [stderr]   Downloaded pathfinder_simd v0.5.3
[INFO] [stderr]   Downloaded halo2_proofs v0.2.0
[INFO] [stderr]   Downloaded freetype-sys v0.20.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 17fb1c19345e8e9c7210500e22481602b17d1fbcded4164c37521e2b18e7598a
[INFO] running `Command { std: "docker" "start" "-a" "17fb1c19345e8e9c7210500e22481602b17d1fbcded4164c37521e2b18e7598a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "17fb1c19345e8e9c7210500e22481602b17d1fbcded4164c37521e2b18e7598a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17fb1c19345e8e9c7210500e22481602b17d1fbcded4164c37521e2b18e7598a", kill_on_drop: false }`
[INFO] [stdout] 17fb1c19345e8e9c7210500e22481602b17d1fbcded4164c37521e2b18e7598a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 29700aa15a895bae63d99bfcfddb1095b51bbf461194ef0db317ae6465bc88b6
[INFO] running `Command { std: "docker" "start" "-a" "29700aa15a895bae63d99bfcfddb1095b51bbf461194ef0db317ae6465bc88b6", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]    Compiling radium v0.7.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]    Compiling proc-macro2 v1.0.81
[INFO] [stderr]    Compiling unicode-ident v1.0.12
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[INFO] [stderr]     Checking bitvec v1.0.1
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[INFO] [stdout] warning: field `is_zero_expr` is never read
[INFO] [stdout]   --> src/gadgets/is_zero.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct IsZeroConfig<F: FieldExt> {
[INFO] [stdout]    |            ------------ field in this struct
[INFO] [stdout] 9  |     pub value_inv: Column<Advice>,
[INFO] [stdout] 10 |     pub is_zero_expr: Expression<F>
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IsZeroConfig` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `is_zero_expr` is never read
[INFO] [stdout]   --> src/gadgets/is_zero.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct IsZeroConfig<F: FieldExt> {
[INFO] [stdout]    |            ------------ field in this struct
[INFO] [stdout] 9  |     pub value_inv: Column<Advice>,
[INFO] [stdout] 10 |     pub is_zero_expr: Expression<F>
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IsZeroConfig` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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 6.51s
[INFO] running `Command { std: "docker" "inspect" "29700aa15a895bae63d99bfcfddb1095b51bbf461194ef0db317ae6465bc88b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29700aa15a895bae63d99bfcfddb1095b51bbf461194ef0db317ae6465bc88b6", kill_on_drop: false }`
[INFO] [stdout] 29700aa15a895bae63d99bfcfddb1095b51bbf461194ef0db317ae6465bc88b6