But we want to be able to parameterize that fixed content.

## A "callable" instance

In Python there's a way to make an instance of a class a "callable".

Not the class itself (which is already a callable), but an instance of that class.

To do that, we declare a method `__call__`:

=== "Python 3.9+"

    ```Python hl_lines="12"

 */
@Experimental
public class XmlWriterException extends MavenException {

    private final Location location;

    /**
     * @param message the message for the exception
     * @param e the exception itself
     */
    public XmlWriterException(String message, Location location, Exception e) {
        super(message, e);
        this.location = location;
    }

    public Location getLocation() {

// the buffered reader to read from r.
// Calling Reset on the zero value of [Reader] initializes the internal buffer
// to the default size.
// Calling b.Reset(b) (that is, resetting a [Reader] to itself) does nothing.
func (b *Reader) Reset(r io.Reader) {
	// If a Reader r is passed to NewReader, NewReader will return r.
	// Different layers of code may do that, and then later pass r

       * executor keeps it alive). Ideally, nulling out `callable` would be the responsibility of
       * InterruptibleTask itself so that its other subclasses also benefit. (Handling `callable` in
       * InterruptibleTask itself might also eliminate some of the existing boilerplate for, e.g.,
       * pendingToString().)
       */
      CombinedFuture.this.task = null;

      setValue(result);

/**
 * Holds a model along with some auxiliary information. This internal utility class assists the model builder during POM
 * processing by providing a means to transport information that cannot be (easily) extracted from the model itself.
 */
record ModelData(ModelSource source, Model model) {

    /**
     * Gets unique identifier of the model
     *
     * @return The effective identifier of the model, never {@code null}.
     */

/**
 * Handles injection of dependency management into the model.
 *
 */
public interface DependencyManagementInjector {

    /**
     * Merges default values from the dependency management section of the given model into itself.
     *
     * @param model The model into which to merge the values specified by its dependency management sections, must not
     *            be <code>null</code>.

                    triggerRules = "+:root=${VersionedSettingsBranch.fromDslContext().vcsRootId()}:."
                    // The promotion itself will be triggered on gradle-promote's master branch
                    branchFilter = "+:master"
                }
            }
        }
    }

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

/**
 * Signals an internal error in Maven itself, e.g. a programming bug.
 *
 */
public class InternalErrorException extends MavenExecutionException {

    public InternalErrorException(String message, Throwable cause) {
        super(message, cause);
    }

     *
     * We could use Suppliers.memoizingSupplier here, but I micro-optimized to this implementation
     * to avoid the extra class for the lambda (and maybe more for memoizingSupplier itself) and the
     * indirection.
     *
     * One thing to *avoid* is a change to make each Logger user use memoizingSupplier directly:
     * That may introduce an extra class for each lambda (currently a dozen).
     */

                    triggerRules = "+:root=${VersionedSettingsBranch.fromDslContext().vcsRootId()}:."
                    // The promotion itself will be triggered on gradle-promote's master branch
                    branchFilter = "+:master"
                }
            }
        }
    }