Function inferCppAutoInitializerType

src/resolution/name-matcher.ts:856–876

* Recover the type of an `auto`-declared local from its initializer on the * declaration line — `auto x = Foo::instance();`, `auto w = make_unique ();`, * `auto p = new W();`, `auto w = Widget();` (#645).

(
  line: string,
  receiverName: string,
  ref: UnresolvedRef,
  context: ResolutionContext,
  depth: number,
)

 * `auto p = new W();`, `auto w = Widget();` (#645).
 */
function inferCppAutoInitializerType(
  line: string,
  receiverName: string,
  ref: UnresolvedRef,
  context: ResolutionContext,
  depth: number,
): string | null {
  const escaped = receiverName.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
  const m = line.match(new RegExp(`\\b${escaped}\\b\\s*=\\s*([^;]+)`));
  if (!m || !m[1]) return null;
  const init = m[1].trim();

  const neu = init.match(/^new\s+([A-Za-z_][\w:]*)/);
  if (neu && neu[1]) return cppLastSegment(neu[1]);

  // A call or construction: `Foo(...)`, `A::b(...)`, `make_unique<T>(...)`.
  const call = init.match(/^([A-Za-z_][\w:]*(?:\s*<[^>;]*>)?)\s*\(/);
  if (call && call[1]) return resolveCppCallResultType(call[1].replace(/\s+/g, ''), ref, context, depth + 1);

  return null;
}

/**
 * Resolve a C++ chained call whose receiver is itself a call — encoded by the