#testmode:repl
l = 1,
l
l.push(2)
l
l.push((3, 4))
l
l.push(99, 1)
l
l.push(99, 10)
l
#---
#(1, )
#(1, 2)
#(1, 2, (3, 4))
#(1, 99, 2, (3, 4))
#ERR:Line 1, column 3: list_push() provided index 10 out of range in list sized 4
#(1, 99, 2, (3, 4))