public Context(ExternalModuleTable mt,Errors errs){
  table=new Hashtable();
  this.exMT=mt;
  this.errors=errs;
  this.lastPair=null;
}

public Context ( ExternalModuleTable mt , Errors errs ) { table = new Hashtable ( ) ; this . exMT = mt ; this . errors = errs ; this . lastPair = null ; }
exmt is the externalmoduletable containing the module whose symboltable this context is part of ( or null ) .
