[INFO] fetching crate frank 0.1.3...
[INFO] checking frank-0.1.3 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate frank 0.1.3 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate frank 0.1.3
[INFO] finished tweaking crates.io crate frank 0.1.3
[INFO] tweaked toml for crates.io crate frank 0.1.3 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate frank 0.1.3 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 48084cc20341c35bd36bfbca3dc1c6bef3d49de8ffb27f2d16b5b9fd8d9be502
[INFO] running `Command { std: "docker" "start" "-a" "48084cc20341c35bd36bfbca3dc1c6bef3d49de8ffb27f2d16b5b9fd8d9be502", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "48084cc20341c35bd36bfbca3dc1c6bef3d49de8ffb27f2d16b5b9fd8d9be502", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48084cc20341c35bd36bfbca3dc1c6bef3d49de8ffb27f2d16b5b9fd8d9be502", kill_on_drop: false }`
[INFO] [stdout] 48084cc20341c35bd36bfbca3dc1c6bef3d49de8ffb27f2d16b5b9fd8d9be502
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b40821b632858cdfc9c7c3fb9759cbb4003981b427ab21674216afb7e7b2c10d
[INFO] running `Command { std: "docker" "start" "-a" "b40821b632858cdfc9c7c3fb9759cbb4003981b427ab21674216afb7e7b2c10d", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking frank v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `remains` is never read
[INFO] [stdout]    --> src/lib.rs:415:13
[INFO] [stdout]     |
[INFO] [stdout] 415 |     let mut remains: i128 = 0; //code works as intended despite "never used" warning here for Rust 2018 v 1.33-nightly.  Play that fiddle...
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `remains` is never read
[INFO] [stdout]    --> src/lib.rs:415:13
[INFO] [stdout]     |
[INFO] [stdout] 415 |     let mut remains: i128 = 0; //code works as intended despite "never used" warning here for Rust 2018 v 1.33-nightly.  Play that fiddle...
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `remains` is never read
[INFO] [stdout]    --> src/main.rs:415:13
[INFO] [stdout]     |
[INFO] [stdout] 415 |     let mut remains: i128 = 0; //code works as intended despite "never used" warning here for Rust 2018 v 1.33-nightly.  Play that fiddle...
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `remains` is never read
[INFO] [stdout]    --> src/main.rs:415:13
[INFO] [stdout]     |
[INFO] [stdout] 415 |     let mut remains: i128 = 0; //code works as intended despite "never used" warning here for Rust 2018 v 1.33-nightly.  Play that fiddle...
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rcl`
[INFO] [stdout]    --> src/main.rs:489:9
[INFO] [stdout]     |
[INFO] [stdout] 489 |     let rcl = rank_count_lesser(&spinning);
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_rcl`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rcl`
[INFO] [stdout]    --> src/main.rs:489:9
[INFO] [stdout]     |
[INFO] [stdout] 489 |     let rcl = rank_count_lesser(&spinning);
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_rcl`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [optimized + debuginfo] target(s) in 1.99s
[INFO] running `Command { std: "docker" "inspect" "b40821b632858cdfc9c7c3fb9759cbb4003981b427ab21674216afb7e7b2c10d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b40821b632858cdfc9c7c3fb9759cbb4003981b427ab21674216afb7e7b2c10d", kill_on_drop: false }`
[INFO] [stdout] b40821b632858cdfc9c7c3fb9759cbb4003981b427ab21674216afb7e7b2c10d