CONCAT
Takes two topmost items and concatenates them, pushes the result to the top of the stack
Input stack: a b
Output stack: ab
PumpkinDB> "Hello, " "world!" CONCAT
"Hello, world!"
Allocation
Allocates for a result of concatenation
EmptyStack error if there are less than two items on the stack
Tests
concat : "Hello, " "world!" CONCAT "Hello, world!" EQUAL?.
concat_requires_two_items_0 : [CONCAT] TRY UNWRAP 0x04 EQUAL?.
concat_requires_two_items_1 : [1 CONCAT] TRY UNWRAP 0x04 EQUAL?.