private function collectConflictsWithin(
        ValidationContext $context,
        array &$conflicts,
        array $fieldMap
    ) {
        // A field map is a keyed collection, where each key represents a response
        // name and the value at that key is a list of all fields which provide that
        // response name. For every response name, if there are multiple fields, they
        // must be compared to find a potential conflict.
        foreach ($fieldMap as $responseName => $fields) {
            // This compares every field in the list to every other field in this list
            // (except to itself). If the list only has one item, nothing needs to
            // be compared.
            $fieldsLength = count($fields);
            if ($fieldsLength <= 1) {
                continue;
            }

            for ($i = 0; $i < $fieldsLength; $i++) {
                for ($j = $i + 1; $j < $fieldsLength; $j++) {
                    $conflict = $this->findConflict(
                        $context,
                        false, // within one collection is never mutually exclusive
                        $responseName,
                        $fields[$i],
                        $fields[$j]
                    );
                    if (! $conflict) {
                        continue;
                    }

                    $conflicts[] = $conflict;
                }
            }
        }
    }