[INFO] fetching crate fern_sim_test 0.1.0...
[INFO] testing fern_sim_test-0.1.0 against master#1871252fc8bb672d40787e67404e6eaae7059369 for pr-125151
[INFO] extracting crate fern_sim_test 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate fern_sim_test 0.1.0 on toolchain 1871252fc8bb672d40787e67404e6eaae7059369
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fern_sim_test 0.1.0
[INFO] finished tweaking crates.io crate fern_sim_test 0.1.0
[INFO] tweaked toml for crates.io crate fern_sim_test 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate fern_sim_test 0.1.0 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" "+1871252fc8bb672d40787e67404e6eaae7059369" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d8b20168ef35bfeb3286aff8834e985e4a84be524608393893fdfe6f514d81c6
[INFO] running `Command { std: "docker" "start" "-a" "d8b20168ef35bfeb3286aff8834e985e4a84be524608393893fdfe6f514d81c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d8b20168ef35bfeb3286aff8834e985e4a84be524608393893fdfe6f514d81c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d8b20168ef35bfeb3286aff8834e985e4a84be524608393893fdfe6f514d81c6", kill_on_drop: false }`
[INFO] [stdout] d8b20168ef35bfeb3286aff8834e985e4a84be524608393893fdfe6f514d81c6
[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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 48551b7ecbd8ce508fc5fc6a92f8bd6058a57cf6ab22dd4882a3f787f0863247
[INFO] running `Command { std: "docker" "start" "-a" "48551b7ecbd8ce508fc5fc6a92f8bd6058a57cf6ab22dd4882a3f787f0863247", kill_on_drop: false }`
[INFO] [stderr]    Compiling fern_sim_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `time`
[INFO] [stdout]   --> src/simulation.rs:37:38
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn apply_sunlight(&mut self, time: Duration) {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_time`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `factory`
[INFO] [stdout]  --> src/spores.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn produce_spore(factory: &mut i32) -> Spore {
[INFO] [stdout]   |                      ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_factory`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `spore`
[INFO] [stdout]   --> src/spores.rs:13:21
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub(crate) fn genes(spore: &Spore) -> Vec<Gene> {
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_spore`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parent`
[INFO] [stdout]   --> src/spores.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn recombine(parent: &mut Cell) {
[INFO] [stdout]    |              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_parent`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]  --> src/spores.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Spore {
[INFO] [stdout]   |            ----- field in this struct
[INFO] [stdout] 6 |     size: f64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `genes` is never used
[INFO] [stdout]   --> src/spores.rs:13:15
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub(crate) fn genes(spore: &Spore) -> Vec<Gene> {
[INFO] [stdout]    |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recombine` is never used
[INFO] [stdout]   --> src/spores.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn recombine(parent: &mut Cell) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cell` is never constructed
[INFO] [stdout]   --> src/spores.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub struct Cell {
[INFO] [stdout]    |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]   --> src/spores.rs:27:16
[INFO] [stdout]    |
[INFO] [stdout] 26 |     impl Cell {
[INFO] [stdout]    |     --------- method in this implementation
[INFO] [stdout] 27 |         pub fn distance_from_origin(&self) -> f64 {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Gene` is never constructed
[INFO] [stdout]   --> src/spores.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub struct Gene;
[INFO] [stdout]    |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "48551b7ecbd8ce508fc5fc6a92f8bd6058a57cf6ab22dd4882a3f787f0863247", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48551b7ecbd8ce508fc5fc6a92f8bd6058a57cf6ab22dd4882a3f787f0863247", kill_on_drop: false }`
[INFO] [stdout] 48551b7ecbd8ce508fc5fc6a92f8bd6058a57cf6ab22dd4882a3f787f0863247
[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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99113d03a74af9233b08b12578095de19e54405d72f136941cea8255493230a8
[INFO] running `Command { std: "docker" "start" "-a" "99113d03a74af9233b08b12578095de19e54405d72f136941cea8255493230a8", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `time`
[INFO] [stdout]   --> src/simulation.rs:37:38
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn apply_sunlight(&mut self, time: Duration) {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_time`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling fern_sim_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `factory`
[INFO] [stdout]  --> src/spores.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn produce_spore(factory: &mut i32) -> Spore {
[INFO] [stdout]   |                      ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_factory`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `spore`
[INFO] [stdout]   --> src/spores.rs:13:21
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub(crate) fn genes(spore: &Spore) -> Vec<Gene> {
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_spore`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parent`
[INFO] [stdout]   --> src/spores.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn recombine(parent: &mut Cell) {
[INFO] [stdout]    |              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_parent`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]  --> src/spores.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Spore {
[INFO] [stdout]   |            ----- field in this struct
[INFO] [stdout] 6 |     size: f64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `genes` is never used
[INFO] [stdout]   --> src/spores.rs:13:15
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub(crate) fn genes(spore: &Spore) -> Vec<Gene> {
[INFO] [stdout]    |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recombine` is never used
[INFO] [stdout]   --> src/spores.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn recombine(parent: &mut Cell) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cell` is never constructed
[INFO] [stdout]   --> src/spores.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub struct Cell {
[INFO] [stdout]    |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]   --> src/spores.rs:27:16
[INFO] [stdout]    |
[INFO] [stdout] 26 |     impl Cell {
[INFO] [stdout]    |     --------- method in this implementation
[INFO] [stdout] 27 |         pub fn distance_from_origin(&self) -> f64 {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Gene` is never constructed
[INFO] [stdout]   --> src/spores.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub struct Gene;
[INFO] [stdout]    |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `time`
[INFO] [stdout]   --> src/simulation.rs:37:38
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn apply_sunlight(&mut self, time: Duration) {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_time`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `factory`
[INFO] [stdout]  --> src/spores.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn produce_spore(factory: &mut i32) -> Spore {
[INFO] [stdout]   |                      ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_factory`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `spore`
[INFO] [stdout]   --> src/spores.rs:13:21
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub(crate) fn genes(spore: &Spore) -> Vec<Gene> {
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_spore`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parent`
[INFO] [stdout]   --> src/spores.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn recombine(parent: &mut Cell) {
[INFO] [stdout]    |              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_parent`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]  --> src/spores.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Spore {
[INFO] [stdout]   |            ----- field in this struct
[INFO] [stdout] 6 |     size: f64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `genes` is never used
[INFO] [stdout]   --> src/spores.rs:13:15
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub(crate) fn genes(spore: &Spore) -> Vec<Gene> {
[INFO] [stdout]    |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recombine` is never used
[INFO] [stdout]   --> src/spores.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn recombine(parent: &mut Cell) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cell` is never constructed
[INFO] [stdout]   --> src/spores.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub struct Cell {
[INFO] [stdout]    |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]   --> src/spores.rs:27:16
[INFO] [stdout]    |
[INFO] [stdout] 26 |     impl Cell {
[INFO] [stdout]    |     --------- method in this implementation
[INFO] [stdout] 27 |         pub fn distance_from_origin(&self) -> f64 {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Gene` is never constructed
[INFO] [stdout]   --> src/spores.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub struct Gene;
[INFO] [stdout]    |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "99113d03a74af9233b08b12578095de19e54405d72f136941cea8255493230a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99113d03a74af9233b08b12578095de19e54405d72f136941cea8255493230a8", kill_on_drop: false }`
[INFO] [stdout] 99113d03a74af9233b08b12578095de19e54405d72f136941cea8255493230a8
[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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 1e9b66c94d7afa4e7442f15626fa4e92e6927476436ad6efc68892b8ae5aebb7
[INFO] running `Command { std: "docker" "start" "-a" "1e9b66c94d7afa4e7442f15626fa4e92e6927476436ad6efc68892b8ae5aebb7", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `time`
[INFO] [stderr]   --> src/simulation.rs:37:38
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn apply_sunlight(&mut self, time: Duration) {
[INFO] [stderr]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_time`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `factory`
[INFO] [stderr]  --> src/spores.rs:9:22
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub fn produce_spore(factory: &mut i32) -> Spore {
[INFO] [stderr]   |                      ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_factory`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `spore`
[INFO] [stderr]   --> src/spores.rs:13:21
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub(crate) fn genes(spore: &Spore) -> Vec<Gene> {
[INFO] [stderr]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_spore`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `parent`
[INFO] [stderr]   --> src/spores.rs:17:14
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn recombine(parent: &mut Cell) {
[INFO] [stderr]    |              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_parent`
[INFO] [stderr] 
[INFO] [stderr] warning: field `size` is never read
[INFO] [stderr]  --> src/spores.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct Spore {
[INFO] [stderr]   |            ----- field in this struct
[INFO] [stderr] 6 |     size: f64,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `genes` is never used
[INFO] [stderr]   --> src/spores.rs:13:15
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub(crate) fn genes(spore: &Spore) -> Vec<Gene> {
[INFO] [stderr]    |               ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `recombine` is never used
[INFO] [stderr]   --> src/spores.rs:17:4
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn recombine(parent: &mut Cell) {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Cell` is never constructed
[INFO] [stderr]   --> src/spores.rs:22:16
[INFO] [stderr]    |
[INFO] [stderr] 22 |     pub struct Cell {
[INFO] [stderr]    |                ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `distance_from_origin` is never used
[INFO] [stderr]   --> src/spores.rs:27:16
[INFO] [stderr]    |
[INFO] [stderr] 26 |     impl Cell {
[INFO] [stderr]    |     --------- method in this implementation
[INFO] [stderr] 27 |         pub fn distance_from_origin(&self) -> f64 {
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Gene` is never constructed
[INFO] [stderr]   --> src/spores.rs:32:16
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub struct Gene;
[INFO] [stderr]    |                ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `fern_sim_test` (lib) generated 10 warnings
[INFO] [stderr] warning: `fern_sim_test` (lib test) generated 10 warnings (10 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/fern_sim_test-14bbebf27b235004)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/efern.rs (/opt/rustwide/target/debug/deps/efern-621557a05ac73344)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/unfurl.rs (/opt/rustwide/target/debug/deps/unfurl-3a034f13114b9164)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_fiddlehead_unfurling ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests fern_sim_test
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/simulation.rs - simulation::Terrarium::apply_sunlight (line 32) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/simulation.rs - simulation::Terrarium::apply_sunlight (line 32) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `fern_sim`
[INFO] [stdout]  --> src/simulation.rs:33:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use fern_sim::Terrarium;
[INFO] [stdout]   |     ^^^^^^^^ use of undeclared crate or module `fern_sim`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/simulation.rs - simulation::Terrarium::apply_sunlight (line 32)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "1e9b66c94d7afa4e7442f15626fa4e92e6927476436ad6efc68892b8ae5aebb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e9b66c94d7afa4e7442f15626fa4e92e6927476436ad6efc68892b8ae5aebb7", kill_on_drop: false }`
[INFO] [stdout] 1e9b66c94d7afa4e7442f15626fa4e92e6927476436ad6efc68892b8ae5aebb7
