[INFO] cloning repository https://github.com/raymond-selvik/sparkenv
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/raymond-selvik/sparkenv" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraymond-selvik%2Fsparkenv", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraymond-selvik%2Fsparkenv'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e3ff3639c67db435b916c1ddf7855ae8eb74502e
[INFO] testing raymond-selvik/sparkenv against 1.91.0 for beta-1.92-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraymond-selvik%2Fsparkenv" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/raymond-selvik/sparkenv
[INFO] finished tweaking git repo https://github.com/raymond-selvik/sparkenv
[INFO] tweaked toml for git repo https://github.com/raymond-selvik/sparkenv written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/raymond-selvik/sparkenv on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/raymond-selvik/sparkenv 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7ed0e5e2417637809bfac6e45b09b13d4725af1e35cdb4c9f85659f010003f1d
[INFO] running `Command { std: "docker" "start" "-a" "7ed0e5e2417637809bfac6e45b09b13d4725af1e35cdb4c9f85659f010003f1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ed0e5e2417637809bfac6e45b09b13d4725af1e35cdb4c9f85659f010003f1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ed0e5e2417637809bfac6e45b09b13d4725af1e35cdb4c9f85659f010003f1d", kill_on_drop: false }`
[INFO] [stdout] 7ed0e5e2417637809bfac6e45b09b13d4725af1e35cdb4c9f85659f010003f1d
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a85ace4d22a72382312faae68deb46ae0e6bc6c35c9d1fdfb68e7e308ce4828b
[INFO] running `Command { std: "docker" "start" "-a" "a85ace4d22a72382312faae68deb46ae0e6bc6c35c9d1fdfb68e7e308ce4828b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]    Compiling cfg-if v1.0.0
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[INFO] [stderr]    Compiling once_cell v1.18.0
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[INFO] [stderr]    Compiling smallvec v1.11.0
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[INFO] [stderr]    Compiling serde v1.0.188
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[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling futures-sink v0.3.28
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[INFO] [stderr]    Compiling futures-util v0.3.28
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[INFO] [stderr]    Compiling lock_api v0.4.10
[INFO] [stderr]    Compiling slab v0.4.8
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[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling futf v0.1.5
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[INFO] [stderr]    Compiling foreign-types-shared v0.1.1
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[INFO] [stderr]    Compiling clap_builder v4.3.23
[INFO] [stderr]    Compiling openssl-sys v0.9.91
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[INFO] [stderr]    Compiling phf_codegen v0.10.0
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[INFO] [stderr]    Compiling markup5ever v0.11.0
[INFO] [stderr]    Compiling serde_derive v1.0.188
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]    Compiling tokio-macros v2.1.0
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[INFO] [stderr]    Compiling clap_derive v4.3.12
[INFO] [stderr]    Compiling tokio v1.32.0
[INFO] [stderr]    Compiling html5ever v0.26.0
[INFO] [stderr]    Compiling clap v4.3.23
[INFO] [stderr]    Compiling futures-executor v0.3.28
[INFO] [stderr]    Compiling futures v0.3.28
[INFO] [stderr]    Compiling tokio-util v0.7.8
[INFO] [stderr]    Compiling tokio-native-tls v0.3.1
[INFO] [stderr]    Compiling string_cache v0.8.7
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling h2 v0.3.20
[INFO] [stderr]    Compiling xml5ever v0.17.0
[INFO] [stderr]    Compiling markup5ever_rcdom v0.2.0
[INFO] [stderr]    Compiling select v0.6.0
[INFO] [stderr]    Compiling hyper v0.14.27
[INFO] [stderr]    Compiling hyper-tls v0.5.0
[INFO] [stderr]    Compiling reqwest v0.11.18
[INFO] [stderr]    Compiling sparkenv v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `clap::Parser`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use clap::Parser;
[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: `std::hash::Hash`
[INFO] [stdout]  --> src/app_config/app_config.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::hash::Hash;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ptr::null`
[INFO] [stdout]  --> src/app_config/app_config.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::ptr::null;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde::ser::SerializeTupleVariant`
[INFO] [stdout]  --> src/app_config/app_config.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use serde::ser::SerializeTupleVariant;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde_json::from_str`
[INFO] [stdout]   --> src/app_config/app_config.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use serde_json::from_str;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `path`
[INFO] [stdout]   --> src/app_config/app_config.rs:33:29
[INFO] [stdout]    |
[INFO] [stdout] 33 |             .map(|(version, path)| version)
[INFO] [stdout]    |                             ^^^^ help: if this is intentional, prefix it with an underscore: `_path`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_versions` is never used
[INFO] [stdout]  --> src/spark_downloader.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub async fn get_versions() {
[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 `Result` that must be used
[INFO] [stdout]   --> src/app_config/app_config.rs:70:5
[INFO] [stdout]    |
[INFO] [stdout] 70 |     serde_json::to_writer(f, &config);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 70 |     let _ = serde_json::to_writer(f, &config);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 38.94s
[INFO] running `Command { std: "docker" "inspect" "a85ace4d22a72382312faae68deb46ae0e6bc6c35c9d1fdfb68e7e308ce4828b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a85ace4d22a72382312faae68deb46ae0e6bc6c35c9d1fdfb68e7e308ce4828b", kill_on_drop: false }`
[INFO] [stdout] a85ace4d22a72382312faae68deb46ae0e6bc6c35c9d1fdfb68e7e308ce4828b
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d8d2392cb83c5250082ad120f598c6c25db18fedefe18db759f52bd534587174
[INFO] running `Command { std: "docker" "start" "-a" "d8d2392cb83c5250082ad120f598c6c25db18fedefe18db759f52bd534587174", kill_on_drop: false }`
[INFO] [stderr]    Compiling sparkenv v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `clap::Parser`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use clap::Parser;
[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: `std::hash::Hash`
[INFO] [stdout]  --> src/app_config/app_config.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::hash::Hash;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ptr::null`
[INFO] [stdout]  --> src/app_config/app_config.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::ptr::null;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde::ser::SerializeTupleVariant`
[INFO] [stdout]  --> src/app_config/app_config.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use serde::ser::SerializeTupleVariant;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde_json::from_str`
[INFO] [stdout]   --> src/app_config/app_config.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use serde_json::from_str;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `path`
[INFO] [stdout]   --> src/app_config/app_config.rs:33:29
[INFO] [stdout]    |
[INFO] [stdout] 33 |             .map(|(version, path)| version)
[INFO] [stdout]    |                             ^^^^ help: if this is intentional, prefix it with an underscore: `_path`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_versions` is never used
[INFO] [stdout]  --> src/spark_downloader.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub async fn get_versions() {
[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 `Result` that must be used
[INFO] [stdout]   --> src/app_config/app_config.rs:70:5
[INFO] [stdout]    |
[INFO] [stdout] 70 |     serde_json::to_writer(f, &config);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 70 |     let _ = serde_json::to_writer(f, &config);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.59s
[INFO] running `Command { std: "docker" "inspect" "d8d2392cb83c5250082ad120f598c6c25db18fedefe18db759f52bd534587174", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d8d2392cb83c5250082ad120f598c6c25db18fedefe18db759f52bd534587174", kill_on_drop: false }`
[INFO] [stdout] d8d2392cb83c5250082ad120f598c6c25db18fedefe18db759f52bd534587174
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 01aa14218429f4975f5c9cf2be0dac61144287a29ae9d217470328142f42477d
[INFO] running `Command { std: "docker" "start" "-a" "01aa14218429f4975f5c9cf2be0dac61144287a29ae9d217470328142f42477d", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `clap::Parser`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use clap::Parser;
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::hash::Hash`
[INFO] [stderr]  --> src/app_config/app_config.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::hash::Hash;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ptr::null`
[INFO] [stderr]  --> src/app_config/app_config.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::ptr::null;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde::ser::SerializeTupleVariant`
[INFO] [stderr]  --> src/app_config/app_config.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use serde::ser::SerializeTupleVariant;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde_json::from_str`
[INFO] [stderr]   --> src/app_config/app_config.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use serde_json::from_str;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path`
[INFO] [stderr]   --> src/app_config/app_config.rs:33:29
[INFO] [stderr]    |
[INFO] [stderr] 33 |             .map(|(version, path)| version)
[INFO] [stderr]    |                             ^^^^ help: if this is intentional, prefix it with an underscore: `_path`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `get_versions` is never used
[INFO] [stderr]  --> src/spark_downloader.rs:5:14
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub async fn get_versions() {
[INFO] [stderr]   |              ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/app_config/app_config.rs:70:5
[INFO] [stderr]    |
[INFO] [stderr] 70 |     serde_json::to_writer(f, &config);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 70 |     let _ = serde_json::to_writer(f, &config);
[INFO] [stderr]    |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `sparkenv` (bin "sparkenv" test) generated 8 warnings (run `cargo fix --bin "sparkenv" --tests` to apply 5 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/sparkenv-994119dc69810805)
[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] running `Command { std: "docker" "inspect" "01aa14218429f4975f5c9cf2be0dac61144287a29ae9d217470328142f42477d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01aa14218429f4975f5c9cf2be0dac61144287a29ae9d217470328142f42477d", kill_on_drop: false }`
[INFO] [stdout] 01aa14218429f4975f5c9cf2be0dac61144287a29ae9d217470328142f42477d