// isIdent reports whether x is an identifier with the given name.
func isIdent(x ast.Node, name string) bool {
	return asIdent(x, name) != nil
}

// newIdent returns a new identifier with the given position and name.
func newIdent(pos token.Pos, name string) *ast.Ident {
	id := ast.NewIdent(name)
	id.NamePos = pos
	return id
}

// insert inserts x at list[at] and moves the remaining elements up.

				}
				switch i {
				case 0:
					cl.Elts[i] = &ast.KeyValueExpr{
						Key:   ast.NewIdent("IP"),
						Value: e,
					}
				case 1:
					if elit, ok := e.(*ast.BasicLit); ok && elit.Value == "0" {
						cl.Elts = append(cl.Elts[:i], cl.Elts[i+1:]...)
					} else {
						cl.Elts[i] = &ast.KeyValueExpr{
							Key:   ast.NewIdent("Port"),
							Value: e,
						}
					}
				}
				fixed = true
			}
		}
	})

				if _, ok := e.(*ast.KeyValueExpr); ok {
					break
				}
				switch i {
				case 0:
					cl.Elts[i] = &ast.KeyValueExpr{
						Key:   ast.NewIdent("Mode"),
						Value: e,
					}
				case 1:
					cl.Elts[i] = &ast.KeyValueExpr{
						Key:   ast.NewIdent("Tabwidth"),
						Value: e,
					}
				}
				fixed = true
			}
		}
	})
	return fixed

	return nil
}

// TestStartExit starts a proxy and ensures the agent exits once the proxy exits
func TestStartExit(t *testing.T) {
	ctx := context.Background()
	done := make(chan struct{})
	a := NewAgent(TestProxy{}, 0, 0, "", 0, 0, 0, true)
	go func() {
		a.Run(ctx)
		done <- struct{}{}
	}()
	<-done
}

// TestStartTwiceStop applies three configs and validates that cleanups are called in order

func filterIdentList(list []*ast.Ident) []*ast.Ident {
	j := 0
	for _, x := range list {
		if token.IsExported(x.Name) {
			list[j] = x
			j++
		}
	}
	return list[0:j]
}

var underscore = ast.NewIdent("_")

func filterCompositeLit(lit *ast.CompositeLit, filter Filter, export bool) {
	n := len(lit.Elts)
	lit.Elts = filterExprList(lit.Elts, filter, export)
	if len(lit.Elts) < n {
		lit.Incomplete = true
	}
}

)

var errAbort = errors.New("proxy aborted")

const errOutOfMemory = "signal: killed"

var activeConnectionCheckDelay = 1 * time.Second

// NewAgent creates a new proxy agent for the proxy start-up and clean-up functions.
func NewAgent(proxy Proxy, terminationDrainDuration, minDrainDuration time.Duration, localhost string,
	adminPort, statusPort, prometheusPort int, exitOnZeroActiveConnections bool,
) *Agent {

			// Copy the FuncDecl, as it may be used elsewhere.
			newF := *f
			newF.Name = ast.NewIdent("main")
			newF.Body, comments = stripOutputComment(f.Body, comments)
			d = &newF
		}
		decls = append(decls, d)
	}

	// Copy the File, as it may be used elsewhere.
	f := *file
	f.Name = ast.NewIdent("main")
	f.Decls = decls
	f.Comments = comments
	return &f
}

	origPos := newField.Type.Pos()
	_, origRecvIsPtr := newField.Type.(*ast.StarExpr)
	newIdent := &ast.Ident{NamePos: origPos, Name: recvTypeName}
	var typ ast.Expr = newIdent
	if !embeddedIsPtr && origRecvIsPtr {
		newIdent.NamePos++ // '*' is one character
		typ = &ast.StarExpr{Star: origPos, X: newIdent}
	}
	newField.Type = typ

	// copy existing receiver field list and set new receiver field

}

// NewAgent hosts the functionality for local SDS and XDS. This consists of the local SDS server and
// associated clients to sign certificates (when not using files), and the local XDS proxy (including
// health checking for VMs and DNS proxying).

			pos := f.Type.Pos() // position of type, for errors
			name := embeddedFieldIdent(f.Type)
			if name == nil {
				check.errorf(f.Type, InvalidSyntaxTree, "embedded field type %s has no name", f.Type)
				name = ast.NewIdent("_")
				name.NamePos = pos
				addInvalid(name)
				continue
			}
			add(name, true) // struct{p.T} field has position of T

			// Because we have a name, typ must be of the form T or *T, where T is the name