code: def declare_variables(uop: Uop, out: CWriter) -> None:
      variables = {"unused"}
      for var in reversed(uop.stack.inputs):
          if var.name not in variables:
              type = var.type if var.type else "PyObject *"
              variables.add(var.name)
              if var.condition:
                  out.emit(f"{type}{var.name} = NULL;\n")
              else:
                  out.emit(f"{type}{var.name};\n")
      for var in uop.stack.outputs:
          if var.name not in variables:
              variables.add(var.name)
              type = var.type if var.type else "PyObject *"
              if var.condition:
                  out.emit(f"{type}{var.name} = NULL;\n")
              else:
                  out.emit(f"{type}{var.name};\n")
  
file_path: cpython/Tools/cases_generator/tier2_generator.py
imports: import argparse
  import os.path
  import sys
  from analyzer import Analysis, Instruction, Uop, Part, analyze_files, Skip, StackItem, analysis_error
  from generators_common import DEFAULT_INPUT, ROOT, write_header, emit_tokens, emit_to, REPLACEMENT_FUNCTIONS
  from cwriter import CWriter
  from typing import TextIO, Iterator
  from lexer import Token
  from stack import StackOffset, Stack, SizeMismatch
label_desc: Use image node_id 1 for calling a global function with example usage: declare_variables(uop, out) without return types