040000 tree b4060bf46ce13319c4193bfa768c0aaadcdc1405	arithmetic
040000 tree e0c9a2c2906c8d6f48896b9579f76198ea474ceb	comparison_operators
040000 tree 7318d0c69ae9b8d25600c4b47b5aed4142198a67	cons
100644 blob 405e1afa44066f3d7357b013cc05e02a6a25e995	io.cc
040000 tree abef32477a3dcd6a5e0e3c4bcdb274cafaf7dbdd	literals
040000 tree 0cda44ae21132b6ed27c6051941cc49065da5c55	requirements