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A pattern for a struct fails to specify a sub-pattern for every one of the
struct's fields.
Erroneous code example:
```compile_fail,E0027
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:
```
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, .. } => {}
}
```
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