Type Alias Decl 

pub(crate) type Decl<'ra> = Interned<'ra, DeclData<'ra>>;

All name declarations are unique and allocated on a same arena, so we can use referential equality to compare them.

Aliased Type

pub(crate) struct Decl<'ra>(pub &'ra DeclData<'ra>, pub PrivateZst);

Tuple Fields

0: &'ra DeclData<'ra>

1: PrivateZst

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes