# Run Clippy on your project
cargo clippy

# Treat warnings as errors (CI/CD)
cargo clippy -- -D warnings

# Auto-fix suggestions
cargo clippy --fix

// Clippy catches hundreds of anti-patterns:

// Before Clippy:
if x == true { }           // warning: equality check with bool
let _ = vec.len() == 0;    // warning: use .is_empty() instead
for i in 0..vec.len() { }  // warning: use .iter().enumerate()

// After Clippy suggestions:
if x { }
let _ = vec.is_empty();
for (i, item) in vec.iter().enumerate() { }

# Format all files
cargo fmt

# Check formatting without changing (CI/CD)
cargo fmt -- --check

# rustfmt.toml — customize formatting (like .editorconfig)
max_width = 100
tab_spaces = 4
use_field_init_shorthand = true

# Generate and open docs (including dependencies)
cargo doc --open

# Run documentation tests
cargo test --doc

/// Calculate the area of a circle.
///
/// # Arguments
/// * `radius` - The radius of the circle (must be non-negative)
///
/// # Examples
/// ```
/// let area = my_crate::circle_area(5.0);
/// assert!((area - 78.54).abs() < 0.01);
/// ```
///
/// # Panics
/// Panics if `radius` is negative.
pub fn circle_area(radius: f64) -> f64 {
    assert!(radius >= 0.0, "radius must be non-negative");
    std::f64::consts::PI * radius * radius
}
// The code in /// ``` blocks is compiled and run during `cargo test`!

# Rebuild on file changes (like dotnet watch)
cargo watch -x check          # Type-check only (fastest)
cargo watch -x test           # Run tests on save
cargo watch -x 'run -- args'  # Run program on save
cargo watch -x clippy         # Lint on save

# See the expanded output of derive macros
cargo expand --lib            # Expand lib.rs
cargo expand module_name      # Expand specific module