[INFO] cloning repository https://github.com/semanticss/root_finder
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/semanticss/root_finder" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsemanticss%2Froot_finder", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsemanticss%2Froot_finder'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 474742ade1fc72613b4e7633a5472a4007f9898c
[INFO] checking semanticss/root_finder against master#a33907a7a5381473eec8bcfa0c56e05a856a911c for pr-151539
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsemanticss%2Froot_finder" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/semanticss/root_finder
[INFO] finished tweaking git repo https://github.com/semanticss/root_finder
[INFO] tweaked toml for git repo https://github.com/semanticss/root_finder written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/semanticss/root_finder on toolchain a33907a7a5381473eec8bcfa0c56e05a856a911c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a33907a7a5381473eec8bcfa0c56e05a856a911c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/semanticss/root_finder 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" "+a33907a7a5381473eec8bcfa0c56e05a856a911c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
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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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+a33907a7a5381473eec8bcfa0c56e05a856a911c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "ebafdfcc4037ccd93c9c0cd413669996dc7bd811cafed398ae94d62335e9181b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ebafdfcc4037ccd93c9c0cd413669996dc7bd811cafed398ae94d62335e9181b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ebafdfcc4037ccd93c9c0cd413669996dc7bd811cafed398ae94d62335e9181b", 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_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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+a33907a7a5381473eec8bcfa0c56e05a856a911c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "e6f7148fcccc427a060df36bed8f4a7a32724a18eb0f4b04a632e9911f281788", kill_on_drop: false }`
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[INFO] [stderr]     Checking root_finder v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Complex` and `DVector`
[INFO] [stdout]  --> src/roots.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nalgebra::{Complex, DMatrix, DVector};
[INFO] [stdout]   |                ^^^^^^^           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rayon::iter::IntoParallelIterator`
[INFO] [stdout]  --> src/roots.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rayon::iter::IntoParallelIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]  --> src/roots.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::fmt;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Complex` and `DVector`
[INFO] [stdout]  --> src/roots.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nalgebra::{Complex, DMatrix, DVector};
[INFO] [stdout]   |                ^^^^^^^           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rayon::iter::IntoParallelIterator`
[INFO] [stdout]  --> src/roots.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rayon::iter::IntoParallelIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]  --> src/roots.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::fmt;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nalgebra`
[INFO] [stdout]  --> src/polynomial.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use nalgebra::*;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Polynomial` is never constructed
[INFO] [stdout]  --> src/polynomial.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Polynomial<T> {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/polynomial.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Polynomial<f64> {
[INFO] [stdout]    | -------------------- associated function in this implementation
[INFO] [stdout] 10 |     pub fn new(cs: Vec<f64>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `newton_raphson` is never used
[INFO] [stdout]  --> src/roots.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn newton_raphson(
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `companion` is never used
[INFO] [stdout]   --> src/roots.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub fn companion(coefficients: Vec<f64>) -> Vec<(f64, f64)> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `batching_companion` is never used
[INFO] [stdout]   --> src/roots.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn batching_companion(flat_coeffs: Vec<f64>, degree: usize) -> (Vec<f64>, Vec<f64>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nalgebra`
[INFO] [stdout]  --> src/polynomial.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use nalgebra::*;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Complex` and `DVector`
[INFO] [stdout]  --> src/roots.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nalgebra::{Complex, DMatrix, DVector};
[INFO] [stdout]   |                ^^^^^^^           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rayon::iter::IntoParallelIterator`
[INFO] [stdout]  --> src/roots.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rayon::iter::IntoParallelIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]  --> src/roots.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::fmt;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Complex` and `DVector`
[INFO] [stdout]  --> src/roots.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nalgebra::{Complex, DMatrix, DVector};
[INFO] [stdout]   |                ^^^^^^^           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rayon::iter::IntoParallelIterator`
[INFO] [stdout]  --> src/roots.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rayon::iter::IntoParallelIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]  --> src/roots.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::fmt;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/tests.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let y = v.data;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `batching_companion` is never used
[INFO] [stdout]   --> src/roots.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn batching_companion(flat_coeffs: Vec<f64>, degree: usize) -> (Vec<f64>, Vec<f64>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nalgebra`
[INFO] [stdout]  --> src/polynomial.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use nalgebra::*;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Polynomial` is never constructed
[INFO] [stdout]  --> src/polynomial.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Polynomial<T> {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/polynomial.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Polynomial<f64> {
[INFO] [stdout]    | -------------------- associated function in this implementation
[INFO] [stdout] 10 |     pub fn new(cs: Vec<f64>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `newton_raphson` is never used
[INFO] [stdout]  --> src/roots.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn newton_raphson(
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nalgebra`
[INFO] [stdout]  --> src/polynomial.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use nalgebra::*;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/tests.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let y = v.data;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 35.27s
[INFO] running `Command { std: "docker" "inspect" "e6f7148fcccc427a060df36bed8f4a7a32724a18eb0f4b04a632e9911f281788", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6f7148fcccc427a060df36bed8f4a7a32724a18eb0f4b04a632e9911f281788", kill_on_drop: false }`
[INFO] [stdout] e6f7148fcccc427a060df36bed8f4a7a32724a18eb0f4b04a632e9911f281788