Function resolveRustPathReference

src/resolution/import-resolver.ts:1828–1858

* Resolve a Rust qualified reference `A::B::C` by mapping the MODULE prefix * (`A::B`) to a file and finding the leaf symbol (`C`) in it. This is the Rust * analog of resolvePythonModuleMember / resolveGoCrossPackageReference * and the precise answer to common-name re-exports (`pu

(
  ref: UnresolvedRef,
  context: ResolutionContext
)

 * so associated-function calls and enum-variant paths fall through untouched.
 */
function resolveRustPathReference(
  ref: UnresolvedRef,
  context: ResolutionContext
): ResolvedRef | null {
  const segments = ref.referenceName.split('::').filter((s) => s.length > 0);
  if (segments.length < 2) return null;
  const leaf = segments[segments.length - 1]!;
  const modSegs = segments.slice(0, -1);

  const file = resolveRustModuleFile(modSegs, ref.filePath, context);
  if (!file || file === ref.filePath) return null;

  const target = context.getNodesInFile(file).find(
    (n) =>
      n.name === leaf &&
      (n.kind === 'function' ||
        n.kind === 'struct' ||
        n.kind === 'union' ||
        n.kind === 'enum' ||
        n.kind === 'trait' ||
        n.kind === 'type_alias' ||
        n.kind === 'constant' ||
        n.kind === 'method' ||
        n.kind === 'class' ||
        n.kind === 'interface')
  );
  if (target) {
    return { original: ref, targetNodeId: target.id, confidence: 0.9, resolvedBy: 'import' };
  }
  return null;
}

/** The crate-root directory (holds `lib.rs`/`main.rs`), walking up from a file. */
function rustCrateRootDir(fromFileAbs: string, context: ResolutionContext): string | null {