E0027 - Error codes index
Description: Book listing all Rust error codes

# Error code E0027

A pattern for a struct fails to specify a sub-pattern for every one of the struct's fields.

Erroneous code example:

    #![allow(unused)]
    fn main() {
    struct Dog {
        name: String,
        age: u32,
    }

    let d = Dog { name: "Rusty".to_string(), age: 8 };

    // This is incorrect.
    match d {
        Dog { age: x } => {}
    }
    }

To fix this error, ensure that each field from the struct's definition is mentioned in the pattern, or use `..` to ignore unwanted fields. Example:

    #![allow(unused)]
    fn main() {
    struct Dog {
        name: String,
        age: u32,
    }

    let d = Dog { name: "Rusty".to_string(), age: 8 };

    match d {
        Dog { name: ref n, age: x } => {}
    }

    // This is also correct (ignore unused fields).
    match d {
        Dog { age: x, .. } => {}
    }
    }