// above.
class Predicate {
 public:
  enum class Kind { kAnd, kOr, kNot, kAndRecurrence, kSymbol, kIntSymbol };

  virtual string ToString() const = 0;

  // An ID assigned to the Predicate at construction time.  Conceptually like a
  // pointer, except that it is stable across runs.
  int64_t id() const { return id_; }

  virtual absl::Span<Predicate* const> GetOperands() const = 0;

	}
}

// Test listing objects.
func (t *Tester) TestList(valid runtime.Object, assignFn AssignFunc) {
	t.testListNotFound(assignFn)
	t.testListFound(valid.DeepCopyObject(), assignFn)
	t.testListMatchLabels(valid.DeepCopyObject(), assignFn)
	t.testListTableConversion(valid.DeepCopyObject(), assignFn)
}

// Test watching objects.
func (t *Tester) TestWatch(
	valid runtime.Object, emitFn EmitFunc,

while loop body has a control barrier (`%barrier`) at the end which forces
a dependency and the two assign variable ops must wait for each other to
complete before starting the next iteration. Transforming these control
outputs to data outputs removes the dependency between the two assign
variable ops, thus allowing them to run in parallel across iterations.

Before:

```mlir

		if p.tok != token.EOF && p.tok != token.SEMICOLON && p.tok != token.RPAREN {
			typ = p.tryIdentOrType()
			if p.tok == token.ASSIGN {
				p.next()
				values = p.parseList(true)
			}
		}
	case token.VAR:
		if p.tok != token.ASSIGN {
			typ = p.parseType()
		}
		if p.tok == token.ASSIGN {
			p.next()
			values = p.parseList(true)
		}
	default:
		panic("unreachable")
	}

  //
  // If an administrator expects that any of these conditions may become true in
  // the future, they should ensure their meshes have different Mesh IDs
  // assigned.
  //
  // Within a multicluster mesh, each cluster must be (manually or auto)
  // configured to have the same Mesh ID value. If an existing cluster 'joins' a

		var msg string
		var reason string
		if len(internal) != 0 {
			msg = fmt.Sprintf("Assigned to service(s) %s, but failed to assign to all requested addresses: %s",
				humanReadableJoin(internal), strings.Join(warnings, "; "))
		} else {
			msg = fmt.Sprintf("Failed to assign to any requested addresses: %s", strings.Join(warnings, "; "))
		}
		if allUsable {
			reason = string(k8s.GatewayReasonAddressNotAssigned)
		} else {

	if p.trace {
		defer un(trace(p, "ConstSpec"))
	}

	idents := p.parseIdentList()
	typ := p.tryType()
	var values []ast.Expr
	if typ != nil || p.tok == token.ASSIGN || iota == 0 {
		p.expect(token.ASSIGN)
		values = p.parseRhsList()
	}
	p.expectSemi() // call before accessing p.linecomment

	// Go spec: The scope of a constant or variable identifier declared inside

					break
				}
				if !s.values[v.ID].needReg {
					continue
				}
				rp, ok := s.f.getHome(v.ID).(*Register)
				if !ok {
					// If v is not assigned a register, pick a register assigned to one of v's inputs.
					// Hopefully v will get assigned that register later.
					// If the inputs have allocated register information, add it to desired,
					// which may reduce spill or copy operations when the register is available.

struct ResourceArgUseInfo {
  // Data type of the data contained in the resource.
  Type data_type;
  // Is the resource argument used in an assign op?
  bool updated;
  // Is the resource argument used in a read or assign op?
  bool used;
};

// Finds the ResourceArgUseInfo for each resource argument. Forwarding to the
// output (i.e., the argument is an operand of the return op) is not considered

  def visit_Attribute(self, node):
    node_type = self._get_inferred_type(node, None)
    if isinstance(node.value, ast.Name):
      if node.value.id == 'ag__':
        # some variables are assigned with 'ag__.xxx' method, we should handle
        # them following the autograph convensions.
        return (node.attr, TFRTypes.AG_BUILTIN_FUNC)

      if node_type == TFRTypes.TF_RAW_OP: