# Local type aliases
`local-type-alias` provides an attribute macro for creating scoped type and trait aliases in an item.
## Examples
```rust
#[local_alias]
#[alias(type X = i32)]
struct MyType<T>
where
X: for<'a> Add<&'a T>,
{
value: T,
}
```
```rust
#[local_alias]
#[alias(
type X = [T; 4],
type Y = *mut X,
type Z = fn(X) -> Y,
trait A = PartialEq<fn([u8; 4]) -> *mut [u8; 4]>,
)]
impl<T> MyType<T>
where
Z: A,
{
// ...
}
```