[INFO] cloning repository https://github.com/T-parrish/Rust_book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/T-parrish/Rust_book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FT-parrish%2FRust_book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FT-parrish%2FRust_book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4667f4d14000a8368b17c309b4988925ec391a4a
[INFO] checking T-parrish/Rust_book against master#642c19bfc3a5c1de985bf5d0cc8207ac9d22708a for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FT-parrish%2FRust_book" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/T-parrish/Rust_book
[INFO] finished tweaking git repo https://github.com/T-parrish/Rust_book
[INFO] tweaked toml for git repo https://github.com/T-parrish/Rust_book written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/T-parrish/Rust_book on toolchain 642c19bfc3a5c1de985bf5d0cc8207ac9d22708a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/T-parrish/Rust_book 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" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fba528250f34395c7d020e643bc8c7875c7865164e7ddc705d0fcbe63ba5fd25
[INFO] running `Command { std: "docker" "start" "-a" "fba528250f34395c7d020e643bc8c7875c7865164e7ddc705d0fcbe63ba5fd25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fba528250f34395c7d020e643bc8c7875c7865164e7ddc705d0fcbe63ba5fd25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fba528250f34395c7d020e643bc8c7875c7865164e7ddc705d0fcbe63ba5fd25", kill_on_drop: false }`
[INFO] [stdout] fba528250f34395c7d020e643bc8c7875c7865164e7ddc705d0fcbe63ba5fd25
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3296547251c441075b33b4c7bfeb4f53232ccfec18471a8bd2762f6d4d38a2e9
[INFO] running `Command { std: "docker" "start" "-a" "3296547251c441075b33b4c7bfeb4f53232ccfec18471a8bd2762f6d4d38a2e9", kill_on_drop: false }`
[INFO] [stderr]     Checking variables v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:58:17
[INFO] [stdout]    |
[INFO] [stdout] 58 |             Int(i32),
[INFO] [stdout]    |             --- ^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 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] 58 -             Int(i32),
[INFO] [stdout] 58 +             Int(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:59:19
[INFO] [stdout]    |
[INFO] [stdout] 59 |             Float(f64),
[INFO] [stdout]    |             ----- ^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 59 -             Float(f64),
[INFO] [stdout] 59 +             Float(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:60:18
[INFO] [stdout]    |
[INFO] [stdout] 60 |             Text(String),
[INFO] [stdout]    |             ---- ^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 60 -             Text(String),
[INFO] [stdout] 60 +             Text(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]  --> src/enums.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     struct IpAddress {
[INFO] [stdout]   |            --------- fields in this struct
[INFO] [stdout] 5 |         kind: IpKind,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout] 6 |         address: String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `IpAddress` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> src/enums.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |         V4(u8, u8, u8, u8),
[INFO] [stdout]    |         -- ^^  ^^  ^^  ^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpKindTerse` 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] 41 -         V4(u8, u8, u8, u8),
[INFO] [stdout] 41 +         V4((), (), (), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/enums.rs:42:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |         V6(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpKindTerse` 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] 42 -         V6(String),
[INFO] [stdout] 42 +         V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/enums.rs:58:16
[INFO] [stdout]    |
[INFO] [stdout] 58 |         Move { x: i32, y: i32 },    // Same as an anonymous struct with x and y pos
[INFO] [stdout]    |         ----   ^       ^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/enums.rs:59:15
[INFO] [stdout]    |
[INFO] [stdout] 59 |         Write(String),              // Same as a tuple struct
[INFO] [stdout]    |         ----- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` 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] 59 -         Write(String),              // Same as a tuple struct
[INFO] [stdout] 59 +         Write(()),              // Same as a tuple struct
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> src/enums.rs:60:21
[INFO] [stdout]    |
[INFO] [stdout] 60 |         ChangeColor(i32, i32, i32), // Also same as a tuple strut
[INFO] [stdout]    |         ----------- ^^^  ^^^  ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` 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] 60 -         ChangeColor(i32, i32, i32), // Also same as a tuple strut
[INFO] [stdout] 60 +         ChangeColor((), (), ()), // Also same as a tuple strut
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/traits.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub struct NewsArticle {
[INFO] [stdout]    |                ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 22 |         pub content: String,
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/traits.rs:35:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub struct Tweet {
[INFO] [stdout]    |                ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 35 |         pub reply: bool,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 36 |         pub retweet: bool,
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]   --> src/box_notes.rs:76:5
[INFO] [stdout]    |
[INFO] [stdout] 76 |     format!("Hello, {}!", name);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[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] 76 |     let _ = format!("Hello, {}!", name);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:58:17
[INFO] [stdout]    |
[INFO] [stdout] 58 |             Int(i32),
[INFO] [stdout]    |             --- ^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 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] 58 -             Int(i32),
[INFO] [stdout] 58 +             Int(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:59:19
[INFO] [stdout]    |
[INFO] [stdout] 59 |             Float(f64),
[INFO] [stdout]    |             ----- ^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 59 -             Float(f64),
[INFO] [stdout] 59 +             Float(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:60:18
[INFO] [stdout]    |
[INFO] [stdout] 60 |             Text(String),
[INFO] [stdout]    |             ---- ^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 60 -             Text(String),
[INFO] [stdout] 60 +             Text(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]  --> src/enums.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     struct IpAddress {
[INFO] [stdout]   |            --------- fields in this struct
[INFO] [stdout] 5 |         kind: IpKind,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout] 6 |         address: String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `IpAddress` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> src/enums.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |         V4(u8, u8, u8, u8),
[INFO] [stdout]    |         -- ^^  ^^  ^^  ^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpKindTerse` 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] 41 -         V4(u8, u8, u8, u8),
[INFO] [stdout] 41 +         V4((), (), (), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/enums.rs:42:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |         V6(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpKindTerse` 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] 42 -         V6(String),
[INFO] [stdout] 42 +         V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/enums.rs:58:16
[INFO] [stdout]    |
[INFO] [stdout] 58 |         Move { x: i32, y: i32 },    // Same as an anonymous struct with x and y pos
[INFO] [stdout]    |         ----   ^       ^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/enums.rs:59:15
[INFO] [stdout]    |
[INFO] [stdout] 59 |         Write(String),              // Same as a tuple struct
[INFO] [stdout]    |         ----- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` 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] 59 -         Write(String),              // Same as a tuple struct
[INFO] [stdout] 59 +         Write(()),              // Same as a tuple struct
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> src/enums.rs:60:21
[INFO] [stdout]    |
[INFO] [stdout] 60 |         ChangeColor(i32, i32, i32), // Also same as a tuple strut
[INFO] [stdout]    |         ----------- ^^^  ^^^  ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` 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] 60 -         ChangeColor(i32, i32, i32), // Also same as a tuple strut
[INFO] [stdout] 60 +         ChangeColor((), (), ()), // Also same as a tuple strut
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/traits.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub struct NewsArticle {
[INFO] [stdout]    |                ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 22 |         pub content: String,
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/traits.rs:35:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub struct Tweet {
[INFO] [stdout]    |                ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 35 |         pub reply: bool,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 36 |         pub retweet: bool,
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CustomSmartPointer` is never constructed
[INFO] [stdout]   --> src/box_notes.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub struct CustomSmartPointer {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]   --> src/box_notes.rs:76:5
[INFO] [stdout]    |
[INFO] [stdout] 76 |     format!("Hello, {}!", name);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[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] 76 |     let _ = format!("Hello, {}!", name);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `Command { std: "docker" "inspect" "3296547251c441075b33b4c7bfeb4f53232ccfec18471a8bd2762f6d4d38a2e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3296547251c441075b33b4c7bfeb4f53232ccfec18471a8bd2762f6d4d38a2e9", kill_on_drop: false }`
[INFO] [stdout] 3296547251c441075b33b4c7bfeb4f53232ccfec18471a8bd2762f6d4d38a2e9
