You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: collector.rs
    path of file: ./repos/rust-analyzer/crates/hir-def/src/nameres
    
    the code of the file until where you have to start completion: //! The core of the module-level name resolution algorithm.
//!
//! `DefCollect
    
    fn resolve_extern_crate(&self, name: &Name) -> Option<CrateRootModuleId> {
        if *name == name![self] {
            cov_mark::hit!(extern_crate_self_as);
            Some(self.def_map.crate_root())
        } else {
            self.deps.get(name).map(|dep| CrateRootModuleId { krate: dep.crate_id })
        }
    }