Struct rustc_trait_selection::traits::specialization_graph::LeafDef

pub struct LeafDef {
    pub item: AssocItem,
    pub defining_node: Node,
    pub finalizing_node: Option<Node>,
}

Information about the most specialized definition of an associated item.

Fields

item: AssocItem

The associated item described by this LeafDef.

defining_node: Node

The node in the specialization graph containing the definition of item.

finalizing_node: Option<Node>

The “top-most” (ie. least specialized) specialization graph node that finalized the definition of item.

Example:

#![feature(specialization)]
trait Tr {
    fn assoc(&self);
}

impl<T> Tr for T {
    default fn assoc(&self) {}
}

impl Tr for u8 {}

If we start the leaf definition search at impl Tr for u8, that impl will be the finalizing_node, while defining_node will be the generic impl.

If the leaf definition search is started at the generic impl, finalizing_node will be None, since the most specialized impl we found still allows overriding the method (doesn’t finalize it).

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: 64 bytes