040000 tree 33f31d43c2a92b9b1aad4df6cbc0233db9371b31	arithmetic
040000 tree 798aea634e67409cfa39c9a942427d7650e14012	comparison_operators
040000 tree f5f2670acba0cc658e00dd021b5b3f0eb49c848d	cons
100644 blob 405e1afa44066f3d7357b013cc05e02a6a25e995	io.cc
040000 tree 9b85478d750e108a56d21bf7b498d58cfdd34237	literals
040000 tree 9be9a40a40172df09cb991cef7f1791cd76636e2	requirements