code: def null(x, y):
      """Placeholder associative op that unifies with any other op"""
      raise ValueError("should never actually evaluate this!")
  
imports: import math
  import operator
  from numbers import Number
  from .op import BINARY_INVERSES, DISTRIBUTIVE_OPS, PRODUCT_TO_POWER, SAFE_BINARY_INVERSES, UNARY_INVERSES, UNITS, BinaryOp, Op, OpMeta, TransformOp, UnaryOp, declare_op_types
label_desc: Use image node_id 1 for calling a global function with example usage: null(x, y) without return types