# Evaluate the 'else' expression if the condition is true.
unless (true) {
    print("good");
 } else {
    print("bad"); # expect: bad
 }
unless (false) {
    print("bad");
 } else {
    print("good"); # expect: bad
 }
# Allow block body.
unless (true) {
    nil;
} else { print("block"); } # expect: block