* @throws Exception if the precondition cannot be checked
     */
    boolean isSatisfied() throws Exception;

    /**
     * Utility method to check if a precondition class is satisfied.
     *
     * @param preconditionClass the class of the precondition to be checked
     * @return true if the precondition is satisfied
     * @throws Exception if the precondition cannot be checked
     */

import java.util.concurrent.Executor;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/** Implementations of {@code Futures.catching*}. */
@GwtCompatible
@ElementTypesAreNonnullByDefault
@SuppressWarnings("nullness") // TODO(b/147136275): Remove once our checker understands & and |.
abstract class AbstractCatchingFuture<

// contexts to canonicalize instances, and it would probably be possible to
// achieve such a guarantee.

// A Context is an opaque type checking context. It may be used to share
// identical type instances across type-checked packages or calls to
// Instantiate. Contexts are safe for concurrent use.
//
// The use of a shared context does not guarantee that identical instances are
// deduplicated in all cases.
type Context struct {

// Implementation

// funcType type-checks a function or method type.
func (check *Checker) funcType(sig *Signature, recvPar *syntax.Field, tparams []*syntax.Field, ftyp *syntax.FuncType) {
	check.openScope(ftyp, "function")
	check.scope.isFunc = true
	check.recordScope(ftyp, check.scope)
	sig.scope = check.scope
	defer check.closeScope()

	if recvPar != nil {

   * - https://github.com/jspecify/jdk/commit/71d826792b8c7ef95d492c50a274deab938f2552
   */
  /*
   * TODO(cpovirk): Is the unchecked cast avoidable? Would System.arraycopy be similarly fast (if
   * likewise not type-checked)? Could our single caller do something different?
   */
  @SuppressWarnings({"nullness", "unchecked"})
  static <T extends @Nullable Object> T[] copy(Object[] source, int from, int to, T[] arrayOfType) {

   * - https://github.com/jspecify/jdk/commit/71d826792b8c7ef95d492c50a274deab938f2552
   */
  /*
   * TODO(cpovirk): Is the unchecked cast avoidable? Would System.arraycopy be similarly fast (if
   * likewise not type-checked)? Could our single caller do something different?
   */
  @SuppressWarnings({"nullness", "unchecked"})
  static <T extends @Nullable Object> T[] copy(Object[] source, int from, int to, T[] arrayOfType) {

// Implementation

// funcType type-checks a function or method type.
func (check *Checker) funcType(sig *Signature, recvPar *ast.FieldList, ftyp *ast.FuncType) {
	check.openScope(ftyp, "function")
	check.scope.isFunc = true
	check.recordScope(ftyp, check.scope)
	sig.scope = check.scope
	defer check.closeScope()

	if recvPar != nil && len(recvPar.List) > 0 {

		for _, check := range checks {
			// no-op the check if we've specified we want to exclude the check
			if excluded.Has(check.Name()) {
				excluded.Delete(check.Name())
				fmt.Fprintf(&individualCheckOutput, "[+]%s excluded: ok\n", check.Name())
				continue
			}
			if err := check.Check(r); err != nil {
				slis.ObserveHealthcheck(context.Background(), check.Name(), name, slis.Error)

package types2

import (
	"cmd/compile/internal/syntax"
	. "internal/types/errors"
)

// labels checks correct label use in body.
func (check *Checker) labels(body *syntax.BlockStmt) {
	// set of all labels in this body
	all := NewScope(nil, body.Pos(), syntax.EndPos(body), "label")

	fwdJumps := check.blockBranches(all, nil, nil, body.List)

	// If there are any forward jumps left, no label was found for

package types

import (
	"go/ast"
	"go/token"
	. "internal/types/errors"
)

// labels checks correct label use in body.
func (check *Checker) labels(body *ast.BlockStmt) {
	// set of all labels in this body
	all := NewScope(nil, body.Pos(), body.End(), "label")

	fwdJumps := check.blockBranches(all, nil, nil, body.List)

	// If there are any forward jumps left, no label was found for