code: def _(x, y):
      return None
  
file_path: sympy/sympy/sets/handlers/mul.py
imports: from sympy.core import Basic, Expr
  from sympy.core.numbers import oo
  from sympy.core.symbol import symbols
  from sympy.multipledispatch import Dispatcher
  from sympy.sets.setexpr import set_mul
  from sympy.sets.sets import Interval, Set
label_desc: Use image node_id 5 for calling a global function with example usage: _(x, y) and returns: None