fun foo(bar: String) {}
                }
                operator fun Source.invoke(arg: String) {}
            """,
            v2 = """
                class Source(some: String?) {
                    fun foo(bar: String?) {}
                }
                operator fun Source.invoke(arg: String?) {}
            """
        ) {
            assertHasNoError()
            assertHasWarnings(

 *
 * @since 4.0.0
 */
@Experimental
public interface Parser {
    /**
     * Parses the given ParserRequest to create an {@link InvokerRequest}.
     * This method does interpret tool arguments.
     *
     * @param parserRequest the request containing all necessary information for parsing

import javassist.CtBehavior

/**
 * Kotlin 2.2 produces bridge methods for invoke operator functions compiled as JVM default methods.
 */
class KotlinInvokeDefaultBridgeFilter implements BehaviorFilter {
    @Override
    boolean matches(CtBehavior ctBehavior) {
        return ctBehavior.name.startsWith("access\$invoke\$jd")
    }

## An app with callbacks { #an-app-with-callbacks }

Let's see all this with an example.

Imagine you develop an app that allows creating invoices.

These invoices will have an `id`, `title` (optional), `customer`, and `total`.

The user of your API (an external developer) will create an invoice in your API with a POST request.

Then your API will (let's imagine):

 * under the License.
 */
package org.apache.maven.cling.invoker.mvnsh;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.ParseException;
import org.apache.maven.api.cli.Options;
import org.apache.maven.api.cli.mvnsh.ShellOptions;
import org.apache.maven.cling.invoker.CommonsCliOptions;

/**
 * Implementation of {@link ShellOptions} (base + shell).
 */

 * under the License.
 */
package org.apache.maven.cling.invoker.mvnup;

import java.util.List;
import java.util.Map;

import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.cli.InvokerRequest;
import org.apache.maven.api.cli.mvnup.UpgradeOptions;
import org.apache.maven.cling.invoker.LookupContext;
import org.jline.reader.LineReader;
import org.jline.utils.AttributedString;

        setTreeIdMethod.setAccessible(true);
        setTreeIdMethod.invoke(response, -1);
        assertFalse(response.isValidTid());

        // Test valid TID
        setTreeIdMethod.invoke(response, 100);
        assertTrue(response.isValidTid());

        // Test zero TID (valid)
        setTreeIdMethod.invoke(response, 0);
        assertTrue(response.isValidTid());
    }

    @Test

import eu.maveniverse.domtrip.maven.MavenPomElements;
import org.apache.maven.api.cli.mvnup.UpgradeOptions;
import org.apache.maven.api.di.Inject;
import org.apache.maven.cling.invoker.mvnup.Goal;
import org.apache.maven.cling.invoker.mvnup.UpgradeContext;

import static eu.maveniverse.domtrip.maven.MavenPomElements.Files.MVN_DIRECTORY;
import static eu.maveniverse.domtrip.maven.MavenPomElements.ModelVersions.MODEL_VERSION_4_1_0;

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.cling.invoker.mvnup.goals;

import java.nio.file.Path;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import eu.maveniverse.domtrip.Document;

import com.google.common.collect.testing.AbstractCollectionTester;
import org.junit.Ignore;

/**
 * A generic JUnit test which tests {@code size()} operations on a collection. Can't be invoked
 * directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible