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extern void *malloc(__SIZE_TYPE__);

enum tree_code {

ERROR_MARK,

IDENTIFIER_NODE,

OP_IDENTIFIER,

TREE_LIST,

TREE_VEC,

BLOCK,

VOID_TYPE,

INTEGER_TYPE,

REAL_TYPE,

COMPLEX_TYPE,

VECTOR_TYPE,

ENUMERAL_TYPE,

BOOLEAN_TYPE,

CHAR_TYPE,

POINTER_TYPE,

OFFSET_TYPE,

REFERENCE_TYPE,

METHOD_TYPE,

FILE_TYPE,

ARRAY_TYPE,

SET_TYPE,

RECORD_TYPE,

UNION_TYPE,

QUAL_UNION_TYPE,

FUNCTION_TYPE,

LANG_TYPE,

INTEGER_CST,

REAL_CST,

COMPLEX_CST,

STRING_CST,

FUNCTION_DECL,

LABEL_DECL,

CONST_DECL,

TYPE_DECL,

VAR_DECL,

PARM_DECL,

RESULT_DECL,

FIELD_DECL,

NAMESPACE_DECL,

COMPONENT_REF,

BIT_FIELD_REF,

INDIRECT_REF,

BUFFER_REF,

ARRAY_REF,

CONSTRUCTOR,

COMPOUND_EXPR,

MODIFY_EXPR,

INIT_EXPR,

TARGET_EXPR,

COND_EXPR,

BIND_EXPR,

CALL_EXPR,

METHOD_CALL_EXPR,

WITH_CLEANUP_EXPR,

CLEANUP_POINT_EXPR,

PLACEHOLDER_EXPR,

WITH_RECORD_EXPR,

PLUS_EXPR,

MINUS_EXPR,

MULT_EXPR,

TRUNC_DIV_EXPR,

CEIL_DIV_EXPR,

FLOOR_DIV_EXPR,

ROUND_DIV_EXPR,

TRUNC_MOD_EXPR,

CEIL_MOD_EXPR,

FLOOR_MOD_EXPR,

ROUND_MOD_EXPR,

RDIV_EXPR,

EXACT_DIV_EXPR,

FIX_TRUNC_EXPR,

FIX_CEIL_EXPR,

FIX_FLOOR_EXPR,

FIX_ROUND_EXPR,

FLOAT_EXPR,

EXPON_EXPR,

NEGATE_EXPR,

MIN_EXPR,

MAX_EXPR,

ABS_EXPR,

FFS_EXPR,

LSHIFT_EXPR,

RSHIFT_EXPR,

LROTATE_EXPR,

RROTATE_EXPR,

BIT_IOR_EXPR,

BIT_XOR_EXPR,

BIT_AND_EXPR,

BIT_ANDTC_EXPR,

BIT_NOT_EXPR,

TRUTH_ANDIF_EXPR,

TRUTH_ORIF_EXPR,

TRUTH_AND_EXPR,

TRUTH_OR_EXPR,

TRUTH_XOR_EXPR,

TRUTH_NOT_EXPR,

LT_EXPR,

LE_EXPR,

GT_EXPR,

GE_EXPR,

EQ_EXPR,

NE_EXPR,

UNORDERED_EXPR,

ORDERED_EXPR,

UNLT_EXPR,

UNLE_EXPR,

UNGT_EXPR,

UNGE_EXPR,

UNEQ_EXPR,

IN_EXPR,

SET_LE_EXPR,

CARD_EXPR,

RANGE_EXPR,

CONVERT_EXPR,

NOP_EXPR,

NON_LVALUE_EXPR,

SAVE_EXPR,

UNSAVE_EXPR,

RTL_EXPR,

ADDR_EXPR,

REFERENCE_EXPR,

ENTRY_VALUE_EXPR,

COMPLEX_EXPR,

CONJ_EXPR,

REALPART_EXPR,

IMAGPART_EXPR,

PREDECREMENT_EXPR,

PREINCREMENT_EXPR,

POSTDECREMENT_EXPR,

POSTINCREMENT_EXPR,

VA_ARG_EXPR,

TRY_CATCH_EXPR,

TRY_FINALLY_EXPR,

GOTO_SUBROUTINE_EXPR,

POPDHC_EXPR,

POPDCC_EXPR,

LABEL_EXPR,

GOTO_EXPR,

RETURN_EXPR,

EXIT_EXPR,

LOOP_EXPR,

LABELED_BLOCK_EXPR,

EXIT_BLOCK_EXPR,

EXPR_WITH_FILE_LOCATION,

SWITCH_EXPR,

  LAST_AND_UNUSED_TREE_CODE

};

typedef union tree_node *tree;

struct tree_common

{

  union tree_node *chain;

  union tree_node *type;

  enum tree_code code : 8;

  unsigned side_effects_flag : 1;

  unsigned constant_flag : 1;

  unsigned permanent_flag : 1;

  unsigned addressable_flag : 1;

  unsigned volatile_flag : 1;

  unsigned readonly_flag : 1;

  unsigned unsigned_flag : 1;

  unsigned asm_written_flag: 1;

  unsigned used_flag : 1;

  unsigned nothrow_flag : 1;

  unsigned static_flag : 1;

  unsigned public_flag : 1;

  unsigned private_flag : 1;

  unsigned protected_flag : 1;

  unsigned bounded_flag : 1;

  unsigned lang_flag_0 : 1;

  unsigned lang_flag_1 : 1;

  unsigned lang_flag_2 : 1;

  unsigned lang_flag_3 : 1;

  unsigned lang_flag_4 : 1;

  unsigned lang_flag_5 : 1;

  unsigned lang_flag_6 : 1;

};

union tree_node

{

  struct tree_common common;

 };

enum c_tree_code {

  C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,

SRCLOC,

SIZEOF_EXPR,

ARROW_EXPR,

ALIGNOF_EXPR,

EXPR_STMT,

COMPOUND_STMT,

DECL_STMT,

IF_STMT,

FOR_STMT,

WHILE_STMT,

DO_STMT,

RETURN_STMT,

BREAK_STMT,

CONTINUE_STMT,

SWITCH_STMT,

GOTO_STMT,

LABEL_STMT,

ASM_STMT,

SCOPE_STMT,

CASE_LABEL,

STMT_EXPR,

  LAST_C_TREE_CODE

};

enum cplus_tree_code {

  CP_DUMMY_TREE_CODE = LAST_C_TREE_CODE,

OFFSET_REF,

PTRMEM_CST,

NEW_EXPR,

VEC_NEW_EXPR,

DELETE_EXPR,

VEC_DELETE_EXPR,

SCOPE_REF,

MEMBER_REF,

TYPE_EXPR,

AGGR_INIT_EXPR,

THROW_EXPR,

EMPTY_CLASS_EXPR,

TEMPLATE_DECL,

TEMPLATE_PARM_INDEX,

TEMPLATE_TYPE_PARM,

TEMPLATE_TEMPLATE_PARM,

BOUND_TEMPLATE_TEMPLATE_PARM,

TYPENAME_TYPE,

TYPEOF_TYPE,

USING_DECL,

DEFAULT_ARG,

TEMPLATE_ID_EXPR,

CPLUS_BINDING,

OVERLOAD,

WRAPPER,

LOOKUP_EXPR,

FUNCTION_NAME,

MODOP_EXPR,

CAST_EXPR,

REINTERPRET_CAST_EXPR,

CONST_CAST_EXPR,

STATIC_CAST_EXPR,

DYNAMIC_CAST_EXPR,

DOTSTAR_EXPR,

TYPEID_EXPR,

PSEUDO_DTOR_EXPR,

SUBOBJECT,

CTOR_STMT,

CLEANUP_STMT,

START_CATCH_STMT,

CTOR_INITIALIZER,

RETURN_INIT,

TRY_BLOCK,

HANDLER,

TAG_DEFN,

IDENTITY_CONV,

LVALUE_CONV,

QUAL_CONV,

STD_CONV,

PTR_CONV,

PMEM_CONV,

BASE_CONV,

REF_BIND,

USER_CONV,

AMBIG_CONV,

RVALUE_CONV,

  LAST_CPLUS_TREE_CODE

};

blah(){}

convert_like_real (convs)

     tree convs;

{

  switch (((enum tree_code) (convs)->common.code))

    {

    case AMBIG_CONV:

      return blah();

    default:

      break;

    };

   abort ();

}

main()

{

  tree convs = (void *)malloc (sizeof (struct tree_common));;

  convs->common.code = AMBIG_CONV;

  convert_like_real (convs);

  exit (0);

}