git-svn-id: https://svn.tlawal.org/svn/monkey@46 f6afcba9-9ef1-4bdd-9b72-7484f5705bac
Interpreter can now evaluate Booleans git-svn-id: https://svn.tlawal.org/svn/monkey@45 f6afcba9-9ef1-4bdd-9b72-7484f5705bac
git-svn-id: https://svn.tlawal.org/svn/monkey@44 f6afcba9-9ef1-4bdd-9b72-7484f5705bac