This directory contains the top level of the compiler.
 Files found here:
 
 phases - the top level calls to the compiler phases; compilation init code
 errors - general error handlers
 globals - global variable definitions
 core-symbols - defines core symbols
 system-init - code to run once after the compiler is loaded.
 driver - top level functions which drive the compiler.  There are called
          from the command interface or directly from the user.