code: def test_issue_6878():
      n = symbols("n", integer=True)
      assert combsimp(RisingFactorial(-10, n)) == 3628800 * (
          -1
      ) ** n / factorial(10 - n)
  
file_path: sympy/sympy/simplify/tests/test_combsimp.py
imports: from sympy.core.numbers import Rational
  from sympy.core.symbol import symbols
  from sympy.functions.combinatorial.factorials import FallingFactorial, RisingFactorial, binomial, factorial
  from sympy.functions.special.gamma_functions import gamma
  from sympy.simplify.combsimp import combsimp
  from sympy.abc import x
label_desc: Use image node_id 2 for calling a global function with example usage: test_issue_6878() without return types