[INFO] cloning repository https://github.com/jcerverap/Rust-The-Rust-Programming-Language
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jcerverap/Rust-The-Rust-Programming-Language" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjcerverap%2FRust-The-Rust-Programming-Language", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjcerverap%2FRust-The-Rust-Programming-Language'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] aaddb8348dbdc3b5828eb107b3690dc7d2d9699a
[INFO] testing jcerverap/Rust-The-Rust-Programming-Language against try#dec9417b8611e34e787a3e4c37686b5131f9e5c5 for pr-154210-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjcerverap%2FRust-The-Rust-Programming-Language" "/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/jcerverap/Rust-The-Rust-Programming-Language
[INFO] finished tweaking git repo https://github.com/jcerverap/Rust-The-Rust-Programming-Language
[INFO] tweaked toml for git repo https://github.com/jcerverap/Rust-The-Rust-Programming-Language written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jcerverap/Rust-The-Rust-Programming-Language on toolchain dec9417b8611e34e787a3e4c37686b5131f9e5c5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jcerverap/Rust-The-Rust-Programming-Language 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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 26690e9e610fe18710327c6f695547aecc0a41dac1eccfa0c8813a15813e4c6d
[INFO] running `Command { std: "docker" "start" "-a" "26690e9e610fe18710327c6f695547aecc0a41dac1eccfa0c8813a15813e4c6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "26690e9e610fe18710327c6f695547aecc0a41dac1eccfa0c8813a15813e4c6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26690e9e610fe18710327c6f695547aecc0a41dac1eccfa0c8813a15813e4c6d", kill_on_drop: false }`
[INFO] [stdout] 26690e9e610fe18710327c6f695547aecc0a41dac1eccfa0c8813a15813e4c6d
[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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9b5dba4142b020fd165c3fba63ccb737c9dbc57d45b58b7fdf027acefa488440
[INFO] running `Command { std: "docker" "start" "-a" "9b5dba4142b020fd165c3fba63ccb737c9dbc57d45b58b7fdf027acefa488440", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.178
[INFO] [stderr]    Compiling proc-macro2 v1.0.103
[INFO] [stderr]    Compiling unicode-ident v1.0.22
[INFO] [stderr]    Compiling quote v1.0.42
[INFO] [stderr]    Compiling zerocopy v0.8.31
[INFO] [stderr]    Compiling syn v2.0.111
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling strum_macros v0.26.4
[INFO] [stderr]    Compiling strum v0.26.3
[INFO] [stderr]    Compiling Rust-The-Rust-Programming-Language v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s4`
[INFO] [stdout]   --> src/ownership.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let s4 = gives_ownership();        // gives_ownership moves its return
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s4`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `subject`
[INFO] [stdout]   --> src/structs.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let subject = AlwaysEqual;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_subject`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |             _ => println!("Exercise mode not implemented yet."),
[INFO] [stdout]    |             ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/main.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 35 |             ExerciseMode::Variables => variables::do_variables(),
[INFO] [stdout]    |             ----------------------- matches some of the same values
[INFO] [stdout] 36 |             ExerciseMode::DataTypes => data_types::do_data_types(),
[INFO] [stdout]    |             ----------------------- matches some of the same values
[INFO] [stdout] 37 |             ExerciseMode::Functions => functions::do_functions(),
[INFO] [stdout]    |             ----------------------- matches some of the same values
[INFO] [stdout] 38 |             ExerciseMode::ControlFlow => control_flow::do_control_flow(),
[INFO] [stdout]    |             ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 45 |             _ => println!("Exercise mode not implemented yet."),
[INFO] [stdout]    |             ^ ...and 6 other patterns collectively make this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/structs.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> src/enums.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct IpAddr {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 24 |     kind: IpAddrKind,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 25 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddress` is never used
[INFO] [stdout]   --> src/enums.rs:29:6
[INFO] [stdout]    |
[INFO] [stdout] 29 | enum IpAddress {
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> src/enums.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 95 |         V4(u8, u8, u8, u8),
[INFO] [stdout]    |         -- ^^  ^^  ^^  ^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrKind` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 95 -         V4(u8, u8, u8, u8),
[INFO] [stdout] 95 +         V4((), (), (), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/enums.rs:96:12
[INFO] [stdout]    |
[INFO] [stdout] 96 |         V6(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrKind` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 96 -         V6(String),
[INFO] [stdout] 96 +         V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.29s
[INFO] running `Command { std: "docker" "inspect" "9b5dba4142b020fd165c3fba63ccb737c9dbc57d45b58b7fdf027acefa488440", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b5dba4142b020fd165c3fba63ccb737c9dbc57d45b58b7fdf027acefa488440", kill_on_drop: false }`
[INFO] [stdout] 9b5dba4142b020fd165c3fba63ccb737c9dbc57d45b58b7fdf027acefa488440
[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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4245e726f7b2da02a9f056e4288e2f26e436513bc491f496acb9fd61ced1ec05
[INFO] running `Command { std: "docker" "start" "-a" "4245e726f7b2da02a9f056e4288e2f26e436513bc491f496acb9fd61ced1ec05", kill_on_drop: false }`
[INFO] [stderr]    Compiling Rust-The-Rust-Programming-Language v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s4`
[INFO] [stdout]   --> src/ownership.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let s4 = gives_ownership();        // gives_ownership moves its return
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s4`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `subject`
[INFO] [stdout]   --> src/structs.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let subject = AlwaysEqual;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_subject`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |             _ => println!("Exercise mode not implemented yet."),
[INFO] [stdout]    |             ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/main.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 35 |             ExerciseMode::Variables => variables::do_variables(),
[INFO] [stdout]    |             ----------------------- matches some of the same values
[INFO] [stdout] 36 |             ExerciseMode::DataTypes => data_types::do_data_types(),
[INFO] [stdout]    |             ----------------------- matches some of the same values
[INFO] [stdout] 37 |             ExerciseMode::Functions => functions::do_functions(),
[INFO] [stdout]    |             ----------------------- matches some of the same values
[INFO] [stdout] 38 |             ExerciseMode::ControlFlow => control_flow::do_control_flow(),
[INFO] [stdout]    |             ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 45 |             _ => println!("Exercise mode not implemented yet."),
[INFO] [stdout]    |             ^ ...and 6 other patterns collectively make this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/structs.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> src/enums.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct IpAddr {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 24 |     kind: IpAddrKind,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 25 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddress` is never used
[INFO] [stdout]   --> src/enums.rs:29:6
[INFO] [stdout]    |
[INFO] [stdout] 29 | enum IpAddress {
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> src/enums.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 95 |         V4(u8, u8, u8, u8),
[INFO] [stdout]    |         -- ^^  ^^  ^^  ^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrKind` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 95 -         V4(u8, u8, u8, u8),
[INFO] [stdout] 95 +         V4((), (), (), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/enums.rs:96:12
[INFO] [stdout]    |
[INFO] [stdout] 96 |         V6(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrKind` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 96 -         V6(String),
[INFO] [stdout] 96 +         V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.72s
[INFO] running `Command { std: "docker" "inspect" "4245e726f7b2da02a9f056e4288e2f26e436513bc491f496acb9fd61ced1ec05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4245e726f7b2da02a9f056e4288e2f26e436513bc491f496acb9fd61ced1ec05", kill_on_drop: false }`
[INFO] [stdout] 4245e726f7b2da02a9f056e4288e2f26e436513bc491f496acb9fd61ced1ec05
[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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] c4c291276642f7fc3c4ddfbdc706df3d3f2c0a931b4a4402ff0709d1c943e122
[INFO] running `Command { std: "docker" "start" "-a" "c4c291276642f7fc3c4ddfbdc706df3d3f2c0a931b4a4402ff0709d1c943e122", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `s4`
[INFO] [stderr]   --> src/ownership.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     let s4 = gives_ownership();        // gives_ownership moves its return
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s4`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `subject`
[INFO] [stderr]   --> src/structs.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let subject = AlwaysEqual;
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_subject`
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]   --> src/main.rs:45:13
[INFO] [stderr]    |
[INFO] [stderr] 45 |             _ => println!("Exercise mode not implemented yet."),
[INFO] [stderr]    |             ^ no value can reach this
[INFO] [stderr]    |
[INFO] [stderr] note: multiple earlier patterns match some of the same values
[INFO] [stderr]   --> src/main.rs:45:13
[INFO] [stderr]    |
[INFO] [stderr] 35 |             ExerciseMode::Variables => variables::do_variables(),
[INFO] [stderr]    |             ----------------------- matches some of the same values
[INFO] [stderr] 36 |             ExerciseMode::DataTypes => data_types::do_data_types(),
[INFO] [stderr]    |             ----------------------- matches some of the same values
[INFO] [stderr] 37 |             ExerciseMode::Functions => functions::do_functions(),
[INFO] [stderr]    |             ----------------------- matches some of the same values
[INFO] [stderr] 38 |             ExerciseMode::ControlFlow => control_flow::do_control_flow(),
[INFO] [stderr]    |             ------------------------- matches some of the same values
[INFO] [stderr] ...
[INFO] [stderr] 45 |             _ => println!("Exercise mode not implemented yet."),
[INFO] [stderr]    |             ^ ...and 6 other patterns collectively make this unreachable
[INFO] [stderr]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `build_user` is never used
[INFO] [stderr]   --> src/structs.rs:80:4
[INFO] [stderr]    |
[INFO] [stderr] 80 | fn build_user(email: String, username: String) -> User {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `kind` and `address` are never read
[INFO] [stderr]   --> src/enums.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 23 | struct IpAddr {
[INFO] [stderr]    |        ------ fields in this struct
[INFO] [stderr] 24 |     kind: IpAddrKind,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 25 |     address: String,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: enum `IpAddress` is never used
[INFO] [stderr]   --> src/enums.rs:29:6
[INFO] [stderr]    |
[INFO] [stderr] 29 | enum IpAddress {
[INFO] [stderr]    |      ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stderr]   --> src/enums.rs:95:12
[INFO] [stderr]    |
[INFO] [stderr] 95 |         V4(u8, u8, u8, u8),
[INFO] [stderr]    |         -- ^^  ^^  ^^  ^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         fields in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `IpAddrKind` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]    |
[INFO] [stderr] 95 -         V4(u8, u8, u8, u8),
[INFO] [stderr] 95 +         V4((), (), (), ()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/enums.rs:96:12
[INFO] [stderr]    |
[INFO] [stderr] 96 |         V6(String),
[INFO] [stderr]    |         -- ^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `IpAddrKind` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 96 -         V6(String),
[INFO] [stderr] 96 +         V6(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: `Rust-The-Rust-Programming-Language` (bin "Rust-The-Rust-Programming-Language" test) generated 8 warnings (run `cargo fix --bin "Rust-The-Rust-Programming-Language" -p Rust-The-Rust-Programming-Language --tests` to apply 2 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/Rust_The_Rust_Programming_Language-4b94505d3ff07d5d)
[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" "c4c291276642f7fc3c4ddfbdc706df3d3f2c0a931b4a4402ff0709d1c943e122", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4c291276642f7fc3c4ddfbdc706df3d3f2c0a931b4a4402ff0709d1c943e122", kill_on_drop: false }`
[INFO] [stdout] c4c291276642f7fc3c4ddfbdc706df3d3f2c0a931b4a4402ff0709d1c943e122