/* returns the 'main' position of an element in a table (that is, the index of its hash value)  */
static Node* mainposition(const Table *t, const TValue *key)
/* returns the 'main' position of an element in a table (that is, the index of its hash value)  */
static Node* mainposition(const Table *t, const TValue *key)
{
    case LUA_TNUMINT:
      return hashint(t, ivalue(key));
    case LUA_TNUMFLT:
      return hashmod(t, l_hashfloat(fltvalue(key)));
    case LUA_TSHRSTR:
      return hashstr(t, tsvalue(key));
    case LUA_TLNGSTR:
      return hashpow2(t, luaS_hashlongstr(tsvalue(key)));
    case LUA_TBOOLEAN:
      return hashboolean(t, bvalue(key));
    case LUA_TLIGHTUSERDATA:
      return hashpointer(t, pvalue(key));
    case LUA_TLCF:
      return hashpointer(t, fvalue(key));
    default:
      lua_assert(!ttisdeadkey(key));
      return hashpointer(t, gcvalue(key));
  }
}