void bindIfNotBound(String modName,ModulePointer modPointer){
  if (context.get(modName) == null)   context.put(modName,modPointer);
}

void bindIfNotBound ( String modName , ModulePointer modPointer ) { if ( context . get ( modName ) == null ) context . put ( modName , modPointer ) ; }
bind a module name to a particular modulepointer iff that name is not already bound ; otherwise no - op .
