Derive Macro Flat 

#[derive(Flat)]
{
    // Attributes available to this derive:
    #[flat]
}

Derive Flat and Emit for region-based storage.

Generates implementations for both the Flat marker trait and the Emit builder trait, enabling declarative region construction.

Field attributes

#[flat(into)]

On a primitive or Other-classified field, the generated make() builder accepts impl Into<T> instead of T. This allows callers to pass values that can be cheaply converted.

#[derive(Flat)]
struct Inst {
  #[flat(into)]
  op: u16,
  typ: Type,
}

// Now `op` accepts any `impl Into<u16>`:
Inst::make(42u8, Type(0))

Variant attributes

#[flat(rename = "name")]

On an enum variant, overrides the generated make_* method name.

#[derive(Flat)]
#[repr(C, u8)]
enum Term {
  #[flat(rename = "ret")]
  Return { values: NearList<Value> },
  Jmp(Jmp),
}

// Instead of `Term::make_return(...)`:
Term::ret(...)