nicer error handling
fixed imports
removed DEF ast node
global scope
scope iterator
cleanup
break and return checks, constant symbol
using and printing Constant
const checking and program scope
ValueTable
Merge branch 'master' into codegen
binop visitor implemented for add and sub
build fix
trying to generate simple expression
local variables instead of temporaries
var and method visitors
type iterator, mjmodule refactoring
namespace cleanup
Values class
Values