TUCK
Copy the top stack item below the second stack item.
Input stack: a b
Output stack: b a b
PumpkinDB> 0x10 0x20 TUCK
0x20 0x10 0x20
Allocation
None
Errors
EmptyStack error if there are less than two items on the stack
Tests
works : 1 2 TUCK STACK [2 1 2] EQUAL?.
empty_stack : [TUCK] TRY UNWRAP 0x04 EQUAL?.
empty_stack_1 : [1 TUCK] TRY UNWRAP 0x04 EQUAL?.