Function format

test/common/heap.js:277–277

(val)

        return [];
      }
      const format = (val) => util.inspect(val, { breakLength: 128, depth: 3 });
      console.error('#');
      console.error('# Retaining path to search for:');
      for (let j = 0; j < retainingPath.length; ++j) {