extern const char *const x1f4_c1_empty_string;
x1f4_c1_empty_string points to some memory address at which the first
byte is 0 and thus making for some empty string. It is used by the
interpreter to initialize string variables. The interpreter will not attempt
to free resources associated with string variables having this value via some
application provided clean up method, neither when the scope of the string
variables is exited nor when cleaning up after an interrupted program
execution.
See struct x1f4_c1_type.