Empty Sort Processing

[amdorsey12]

Given a program with empty sorts, such as:

sorts

#booleans = {true, false}.

#garage = {r2}.

#john = {r1}.

#football = {r3}.

#activity = {}.

#carry = {}.

Running java -jar sparc.jar program.sparc produces the following output and then terminates:

SPARC  V2.56
sort activity defined at line 11 column 2 is empty