code: def test_ternary_operator(self) -> None:
      grammar_source = """
          start[mod_ty]: a=expr ENDMARKER { _PyAST_Module(a, NULL, p->arena) }
          expr[asdl_stmt_seq*]: a=listcomp NEWLINE { (asdl_stmt_seq*)_PyPegen_singleton_seq(p, _PyAST_Expr(a, EXTRA)) }
          listcomp[expr_ty]: (
              a='[' b=NAME c=for_if_clauses d=']' { _PyAST_ListComp(b, c, EXTRA) }
          )
          for_if_clauses[asdl_comprehension_seq*]: (
              a[asdl_comprehension_seq*]=(y=['async'] 'for' a=NAME 'in' b=NAME c[asdl_expr_seq*]=('if' z=NAME { z })*
                  { _PyAST_comprehension(_PyAST_Name(((expr_ty) a)->v.Name.id, Store, EXTRA), b, c, (y == NULL) ? 0 : 1, p->arena) })+ { a }
          )
          """
      test_source = """
          stmt = "[i for i in a if b]"
          self.verify_ast_generation(stmt)
          """
      self.run_test(grammar_source, test_source)
  
imports: import contextlib
  import subprocess
  import sysconfig
  import textwrap
  import unittest
  import os
  import shutil
  import tempfile
  from pathlib import Path
  from test import test_tools
  from test import support
  from test.support import os_helper, import_helper
  from test.support.script_helper import assert_python_ok
label_desc: Use image node_id 21 for calling the TestCParser obj's underlying member method code with example usage: obj.test_ternary_operator() without return types