Macro try_extract_matches

macro_rules! try_extract_matches {
    ($e:expr, $variant:path) => { ... };
}

Macro to try to evaluate an expression as a pattern and extract its fields.

Examples:

use cairo_lang_utils::try_extract_matches;

#[derive(Debug, Clone, Copy)]
struct Point {
    x: u32,
    y: u32,
}
#[derive(Debug)]
enum MyEnum {
    Point(Point),
    Value(u32),
}
let p = MyEnum::Point(Point { x: 3, y: 5 });
if let Some(Point { x, y: _ }) = try_extract_matches!(p, MyEnum::Point) {
    assert_eq!(x, 3);
}