Clap derive fails - rust

Question

I am creating a project in Rust and just wanted to add a command line parser using clap.
However, my project fails to build:
args.rs
use clap::Parser;
/// Simple program to greet a person
#[derive(Parser, Debug)]
#[clap(author, version, about, long_about = None)]
pub struct Args {
/// Optional name to operate on
#[clap(short, long, value_parser)]
width: usize,
/// Sets a custom config file
#[clap(short, long, value_parser)]
height: usize,
/// Turn debugging information on
#[clap(short, long, value_parser)]
mines: u8,
}
Cargo.toml:
[package]
name = "rustymines"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
rand = "*"
grid = { git = "https://github.com/conqp/grid.git", branch = "main" }
clap = { version = "3.2.22", features = ["derive"] }
Error:
$ cargo build
Compiling libc v0.2.133
Compiling version_check v0.9.4
Compiling proc-macro2 v1.0.44
Compiling unicode-ident v1.0.4
Compiling quote v1.0.21
Compiling syn v1.0.101
Compiling cfg-if v1.0.0
Compiling autocfg v1.1.0
Compiling ppv-lite86 v0.2.16
Compiling heck v0.4.0
Compiling os_str_bytes v6.3.0
Compiling hashbrown v0.12.3
Compiling termcolor v1.1.3
Compiling once_cell v1.15.0
Compiling strsim v0.10.0
Compiling bitflags v1.3.2
Compiling textwrap v0.15.1
Compiling grid v0.1.0 (https://github.com/conqp/grid.git?branch=main#227750b9)
Compiling proc-macro-error-attr v1.0.4
Compiling proc-macro-error v1.0.4
Compiling clap_lex v0.2.4
Compiling indexmap v1.9.1
Compiling getrandom v0.2.7
Compiling atty v0.2.14
Compiling rand_core v0.6.4
Compiling rand_chacha v0.3.1
Compiling rand v0.8.5
Compiling clap_derive v3.2.18
Compiling clap v3.2.22
Compiling rustymines v0.1.0 (/home/rne/Projekte/rustymines)
error[E0616]: field `width` of struct `args::Args` is private
--> src/game.rs:26:24
|
26 | Self::new(args.width, args.height, args.mines)
| ^^^^^ private field
error[E0616]: field `height` of struct `args::Args` is private
--> src/game.rs:26:36
|
26 | Self::new(args.width, args.height, args.mines)
| ^^^^^^ private field
error[E0616]: field `mines` of struct `args::Args` is private
--> src/game.rs:26:49
|
26 | Self::new(args.width, args.height, args.mines)
| ^^^^^ private field
error[E0599]: no function or associated item named `parse` found for struct `args::Args` in the current scope
--> src/game.rs:30:26
|
30 | let args = Args::parse();
| ^^^^^ function or associated item not found in `args::Args`
|
::: src/game/args.rs:6:1
|
6 | pub struct Args {
| --------------- function or associated item `parse` not found for this
|
= help: items from traits can only be used if the trait is in scope
help: the following trait is implemented but not in scope; perhaps add a `use` for it:
|
1 | use clap::Parser;
|
Some errors have detailed explanations: E0599, E0616.
For more information about an error, try `rustc --explain E0599`.
error: could not compile `rustymines` due to 4 previous errors
Note that none of the errors should happen, since, according to the linked clap cookbook, clap should work some magic and make the fields publicly accessible as well as implement the parse() function.
What's the issue here?
PS:
$ rustup show
Default host: x86_64-unknown-linux-gnu
rustup home: /home/rne/.rustup
stable-x86_64-unknown-linux-gnu (default)
rustc 1.63.0 (4b91a6ea7 2022-08-08)