penum

Enforce patterns for enums

```rust use penum::shape;

trait Trait {} impl Trait for f32 {} impl Trait for i32 {}

trait Advanced {} impl Advanced for usize {}

[shape[(T, T, U) | (T, U) | { name: T } where T: Trait, U: Advanced]]

enum Vector3 { Integer(i32, f32, usize), Float(f32, i32, usize), }

[shape[{ name: _, age: usize } where usize: Advanced]]

enum Strategy<'a> { V1 { name: String, age: usize }, V2 { name: usize, age: usize }, V3 { name: &'a str, age: usize }, }

[shape[{ name: &'a str, age: usize }]]

enum Concrete<'a> { Static { name: &'a str, age: usize }, } ```

```rust

[shape[tuple(_)]]

enum Must<'a> { Static { name: &'a str, age: usize } ^^^^^^^^^^^^^^^^^^^^^^^^^^^ Static { name : & 'a str, age : usize } doesn't match pattern tuple(_) }

[shape[tuple(T) where T: Trait]]

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait boundusize: Traitis not satisfied enum Must { Static (usize) } ```