// restricted to matching packages in the main module.
			pkgPattern, mainModule := modload.MainModules.DirImportPath(ctx, q.pattern)
			if pkgPattern == "." {
				modload.MustHaveModRoot()
				var modRoots []string
				for _, m := range modload.MainModules.Versions() {
					modRoots = append(modRoots, modload.MainModules.ModRoot(m))
				}
				var plural string
				if len(modRoots) != 1 {
					plural = "s"

			}
		}
	}
	for _, modFile := range modFiles {
		checkReplace(modFile.Replace)
	}
	if MainModules.workFile != nil {
		checkReplace(MainModules.workFile.Replace)
	}

	for _, mod := range vendorList {
		meta := vendorMeta[mod]
		if meta.Explicit {
			// in workspace mode, check that it's required by at least one of the main modules

     */
    protected open fun shouldSkipValidityCheck(session: SESSION): Boolean = false

    override fun doTest(testServices: TestServices) {
        val ktModules = testServices.ktTestModuleStructure.mainModules.map { it.ktModule }

        val sessionsBeforeModification = getSessions(ktModules)
        checkSessionValidityBeforeModification(sessionsBeforeModification, testServices)

	}
}

func verifyMod(ctx context.Context, mod module.Version) []error {
	if gover.IsToolchain(mod.Path) {
		// "go" and "toolchain" have no disk footprint; nothing to verify.
		return nil
	}
	if modload.MainModules.Contains(mod.Path) {
		return nil
	}
	var errs []error
	zip, zipErr := modfetch.CachePath(ctx, mod, "zip")
	if zipErr == nil {
		_, zipErr = os.Stat(zip)
	}
	dir, dirErr := modfetch.DownloadDir(ctx, mod)

			// request that we remove all module requirements, leaving only the main
			// module and standard library. Perhaps we should implement that someday.
			return &modload.QueryUpgradesAllError{
				MainModules: modload.MainModules.Versions(),
				Query:       q.version,
			}
		}
	}

	if search.IsMetaPackage(q.pattern) && q.pattern != "all" {
		if q.pattern != q.raw {

	if m.Version == "" && MainModules.Contains(m.Path) {
		info := &modinfo.ModulePublic{
			Path:    m.Path,
			Version: m.Version,
			Main:    true,
		}
		if v, ok := rawGoVersion.Load(m); ok {
			info.GoVersion = v.(string)
		} else {
			panic("internal error: GoVersion not set for main module")
		}
		if modRoot := MainModules.ModRoot(m); modRoot != "" {
			info.Dir = modRoot

	if len(args) == 0 {
		var ms []*modinfo.ModulePublic
		for _, m := range MainModules.Versions() {
			if gover.IsToolchain(m.Path) {
				continue
			}
			ms = append(ms, moduleInfo(ctx, rs, m, mode, reuse))
		}
		return rs, ms, nil
	}

	needFullGraph := false

			// If we couldn't load the graph, we don't know what its requirements were
			// to begin with, so we can't edit those requirements in a coherent way.
			return orig, false, err
		}
		bl := mg.BuildList()[MainModules.Len():]
		selectedRoot = make(map[string]string, len(bl))
		for _, m := range bl {
			selectedRoot[m.Path] = m.Version
		}
	}

	for _, r := range tryUpgrade {

		// users) by writing the failing input to the package's testdata directory.
		// (See https://golang.org/issue/48495 and test_fuzz_modcache.txt.)
		mainMods := modload.MainModules
		if m := pkgs[0].Module; m != nil && m.Path != "" {
			if !mainMods.Contains(m.Path) {
				base.Fatalf("cannot use -fuzz flag on package outside the main module")
			}

        buildFile << """
            dependencies {
                api "org:main:1.0"
            }
        """

        when:
        mainModule.pom.expectGet()
        mainModule.moduleMetadata.expectGet()
        mainModule.artifact.expectGet()
        dep.pom.expectGet()
        dep.artifact.expectGet()

        run ':checkDeps'

        then:
        resolve.expectGraph {