Function inherited_default_methods 

pub fn inherited_default_methods(
    registry: &TraitDeclRegistry,
    trait_path: &TypePath,
    impl_methods: &[AIRNode],
) -> Vec<AIRNode>

Resolve, for an impl Trait for Type block, the trait default methods that the impl does not override and that must therefore be synthesized onto the target. trait_path is the ImplBlock’s trait_path; impl_methods its own methods. Returns cloned default-method FnDecl nodes, in trait-declaration order. Empty when the impl has no trait, the trait is unknown, or every default is overridden. Returns owned clones (rather than registry borrows) so a backend can iterate them while mutating its own emission buffer, without holding a borrow of the registry across the &mut self writes.