in src/IndexedPathProvider.hack [50:61]
private function isMethodDefined(
dict<string, Documentable> $index,
string $classish,
string $method,
): bool {
$parent = $index[$classish]['definition'] ?? null;
if (!$parent is ScannedClassish) {
return false;
}
return C\any($parent->getMethods(), $m ==> $m->getName() === $method);
}