Struct WrapTarget 

pub struct WrapTarget {
    pub path: SmallVec<[u8; 4]>,
    pub wrap_as_trait_id: u32,
}

One auto-boxing site inside an Erase_T-rewritten return type.

path walks the generic-argument tree from the outer return type:

• Self in return position → path = [] (the whole return)
• Result<Self, Error> → path = [0] (the Ok arm)
• (Self, Self) (tuple) → two entries, path = [0] and path = [1]
• HashMap<int, Self> → path = [1] (the value type)
• Option<Result<Self, Error>> → path = [0, 0] (the inner Ok arm)

wrap_as_trait_id is the trait the boxed value should advertise itself under — usually the receiver trait’s id, but for Self::A (associated-type return with bound Bound) the bound’s trait id per §Q25.C.1 row 4.

Fields

path: SmallVec<[u8; 4]>

Argument-index path into the structural return type.

wrap_as_trait_id: u32

Trait the wrapped value’s vtable should be registered against.

Trait Implementations

impl Clone for WrapTarget

fn clone(&self) -> WrapTarget

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WrapTarget

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.