Struct Location 

pub struct Location {
    pub file: PathBuf,
    pub line: usize,
}

Location information for a node.

Rust Book Reference

Chapter 10.2: Traits - Deriving Traits https://doc.rust-lang.org/book/ch10-02-traits.html#deriving-traits

Educational Notes - Derive on Structs

This struct demonstrates deriving traits on a struct with multiple fields:

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Location {
    pub file: PathBuf,
    pub line: usize,
}

How derive works for structs:

• Compiler checks that ALL fields implement the trait
• PathBuf implements Debug, Clone, PartialEq, Eq ✓
• usize implements Debug, Clone, PartialEq, Eq ✓
• Therefore, Location can derive these traits

Generated PartialEq implementation:

impl PartialEq for Location {
    fn eq(&self, other: &Self) -> bool {
        self.file == other.file && self.line == other.line
    }
}

Why this matters:

• Locations can be compared: loc1 == loc2
• Locations can be cloned: loc.clone()
• Locations can be debugged: println!("{:?}", loc)

Fields

file: PathBuf

line: usize

Implementations

impl Location

pub fn new(file: PathBuf, line: usize) -> Self

Trait Implementations

impl Clone for Location

fn clone(&self) -> Location

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Location

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Location

fn eq(&self, other: &Location) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Location

impl StructuralPartialEq for Location