[INFO] cloning repository https://github.com/bbehnkeSE/matrs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bbehnkeSE/matrs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FbbehnkeSE%2Fmatrs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FbbehnkeSE%2Fmatrs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 002e92b66f371f4618e56cdb51293aedaaf445a4
[INFO] checking bbehnkeSE/matrs against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FbbehnkeSE%2Fmatrs" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/bbehnkeSE/matrs
[INFO] finished tweaking git repo https://github.com/bbehnkeSE/matrs
[INFO] tweaked toml for git repo https://github.com/bbehnkeSE/matrs written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/bbehnkeSE/matrs on toolchain 93086cfebfccb79083c59d0d3b2052944bba643c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/bbehnkeSE/matrs 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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5d32ec94caa4c19762dc0a57e57a263f190726f13e6c37885bde007aabc13262
[INFO] running `Command { std: "docker" "start" "-a" "5d32ec94caa4c19762dc0a57e57a263f190726f13e6c37885bde007aabc13262", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5d32ec94caa4c19762dc0a57e57a263f190726f13e6c37885bde007aabc13262", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d32ec94caa4c19762dc0a57e57a263f190726f13e6c37885bde007aabc13262", kill_on_drop: false }`
[INFO] [stdout] 5d32ec94caa4c19762dc0a57e57a263f190726f13e6c37885bde007aabc13262
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] de8f1f0ad05838276a56109a55ae0eee6b33d5f2054d3f7c2c19997b0f42f9f2
[INFO] running `Command { std: "docker" "start" "-a" "de8f1f0ad05838276a56109a55ae0eee6b33d5f2054d3f7c2c19997b0f42f9f2", kill_on_drop: false }`
[INFO] [stderr]     Checking matrs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `row` and `col` are never read
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct Matrix {
[INFO] [stdout]   |            ------ fields in this struct
[INFO] [stdout] 3 |     row: usize,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 4 |     col: usize,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Matrix` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `Matrix` is never constructed
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct Matrix {
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]   = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `row`, `col`, and `data` are never read
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct Matrix {
[INFO] [stdout]   |            ------ fields in this struct
[INFO] [stdout] 3 |     row: usize,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 4 |     col: usize,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 5 |     data: Vec<Vec<f64>>
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Matrix` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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/lib.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Matrix {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 10 |     fn new(row: usize, col: usize) -> Matrix {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `matrs` (lib) due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "de8f1f0ad05838276a56109a55ae0eee6b33d5f2054d3f7c2c19997b0f42f9f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de8f1f0ad05838276a56109a55ae0eee6b33d5f2054d3f7c2c19997b0f42f9f2", kill_on_drop: false }`
[INFO] [stdout] de8f1f0ad05838276a56109a55ae0eee6b33d5f2054d3f7c2c19997b0f42f9f2