failure.assertHasCause('''Type MyPlugin.Rules is not a valid rule source:
- Enclosed classes must be static and non private
- Cannot declare a constructor that takes arguments''')
    }

    def "informative error message when two plugins declare model at the same path"() {
        when:
        buildScript """
            class MyPlugin {
                static class Rules extends RuleSource {

	case 'A':
		typ := r.typ()

		r.declare(types.NewTypeName(pos, r.currPkg, name, typ))

	case 'C':
		typ, val := r.value()

		r.declare(types.NewConst(pos, r.currPkg, name, typ, val))

	case 'F', 'G':
		var tparams []*types.TypeParam
		if tag == 'G' {
			tparams = r.tparamList()
		}
		sig := r.signature(nil, nil, tparams)
		r.declare(types.NewFunc(pos, r.currPkg, name, sig))

However, imagine that you need the _runtime_ and the _test fixtures runtime_ of a component.
Then it is allowed as long as the _runtime_ and _test fixtures runtime_ variant of the library declare different capabilities.

If we do so, a consumer would then have to declare two dependencies:

- one on the "main" feature, the library
- one on the "test fixtures" feature, by _requiring its capability_

                    consumer,
                    producer
                ))
                .solution("Declare task '" + producer + "' as an input of '" + consumer + "'")
                .solution("Declare an explicit dependency on '" + producer + "' from '" + consumer + "' using Task#dependsOn")
                .solution("Declare an explicit dependency on '" + producer + "' from '" + consumer + "' using Task#mustRunAfter")
        );
    }

					</excludes>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.dbflute</groupId>
				<artifactId>dbflute-maven-plugin</artifactId>
				<configuration>
					<dbfluteVersion>${dbflute.version}</dbfluteVersion>
					<packageBase>org.codelibs.fess.dbflute</packageBase>
					<clientProject>fess</clientProject>
					<dbfluteClientDir>${basedir}/dbflute_fess</dbfluteClientDir>

Possible solutions:
  1. Declare task 'producer' as an input of 'consumer'.
  2. Declare an explicit dependency on 'producer' from 'consumer' using Task#dependsOn.
  3. Declare an explicit dependency on 'producer' from 'consumer' using Task#mustRunAfter.

${validationMessage("implicit_dependency")}
"""
    }

			val := r.Value()
			declare(types.NewConst(pos, objPkg, objName, typ, val))

		case pkgbits.ObjFunc:
			pos := r.pos()
			tparams := r.typeParamNames()
			sig := r.signature(nil, nil, tparams)
			declare(types.NewFunc(pos, objPkg, objName, sig))

		case pkgbits.ObjType:
			pos := r.pos()

			obj := types.NewTypeName(pos, objPkg, objName, nil)
			named := types.NewNamed(obj, nil, nil)
			declare(obj)

import org.codelibs.fess.es.config.exentity.WebConfig;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.util.ComponentUtil;
import org.dbflute.cbean.result.ListResultBean;
import org.dbflute.optional.OptionalEntity;
import org.dbflute.optional.OptionalThing;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;

public class CrawlingConfigHelper {

}
def classes = configurations.compile.outgoing.variants['classes']
classes.attributes.keySet().collect { it.name } == ['usage', 'format']
"""

        expect:
        succeeds()
    }

    def "can declare build dependency of artifact using String notation"() {
        given:
        createDirs("a", "b")
        settingsFile << "include 'a', 'b'"
        buildFile << """
            project(':a') {

	host, err := canonicalHost(u.Host)
	if err != nil {
		return
	}
	key := jarKey(host, j.psList)
	defPath := defaultPath(u.Path)

	j.mu.Lock()
	defer j.mu.Unlock()

	submap := j.entries[key]

	modified := false
	for _, cookie := range cookies {
		e, remove, err := j.newEntry(cookie, now, defPath, host)
		if err != nil {
			continue
		}
		id := e.id()
		if remove {
			if submap != nil {