[@lyxal: 60341916]
4
1
7
2
8

[@lyxal: 60341957]
9
7
24
1/2

[@lyxal: 60342153]
11

STDERR:
stack.append(sympy.nsimplify("1"))

stack.append(sympy.nsimplify("2"))

stack.append(sympy.nsimplify("3"))

stack.append(sympy.nsimplify("4"))

stack.append(sympy.nsimplify("5"))

stack.append(sympy.nsimplify("6"))

rhs, lhs = pop(stack, 2, ctx); stack.append(add(lhs, rhs, ctx=ctx))

stack.append(sympy.nsimplify("4"))

lhs = pop(stack, 1, ctx); stack.append(halve(lhs, ctx=ctx))