for _, pkg := range pkgs {
		m := modload.PackageModule(pkg)
		if m.Path == "" || modload.MainModules.Contains(m.Path) {
			continue
		}
		modpkgs[m] = append(modpkgs[m], pkg)
	}
	checkPathCollisions(modpkgs)

	includeAllReplacements := false
	includeGoVersions := false
	isExplicit := map[module.Version]bool{}
	gv := modload.MainModules.GoVersion()

type PackageNotInModuleError struct {
	MainModules []module.Version
	Mod         module.Version
	Replacement module.Version
	Query       string
	Pattern     string
}

func (e *PackageNotInModuleError) Error() string {
	if len(e.MainModules) > 0 {
		prefix := "workspace modules do"
		if len(e.MainModules) == 1 {
			prefix = fmt.Sprintf("main module (%s) does", e.MainModules[0])

public class KtModuleProviderBuilder(
    public val kotlinCoreProjectEnvironment: KotlinCoreProjectEnvironment,
) {
    private val mainModules: MutableList<KtModule> = mutableListOf()

    public fun <M : KtModule> addModule(module: M): M {
        mainModules.add(module)
        return module
    }

    public lateinit var platform: TargetPlatform

    public fun build(): KtStaticProjectStructureProvider {

			continue
		}

		var (
			root, modPrefix string
			isLocal         bool
		)
		if MainModules.Contains(mod.Path) {
			if MainModules.ModRoot(mod) == "" {
				continue // If there is no main module, we can't search in it.
			}
			root = MainModules.ModRoot(mod)
			modPrefix = MainModules.PathPrefix(mod)
			isLocal = true
		} else {
			var err error
			root, isLocal, err = fetch(ctx, mod)

	if MainModules == nil {
		return module.Version{}, "", ""
	} else if MainModules.Contains(mod.Path) && mod.Version == "" {
		// Don't replace the workspace version of the main module.
		return module.Version{}, "", ""
	}
	if _, r, ok := replacement(mod, MainModules.WorkFileReplaceMap()); ok {
		return r, "", workFilePath
	}
	for _, v := range MainModules.Versions() {

		replacedByWorkFile[r.Old.Path] = true
		v, ok := mainModules.highestReplaced[r.Old.Path]
		if !ok || gover.ModCompare(r.Old.Path, r.Old.Version, v) > 0 {
			mainModules.highestReplaced[r.Old.Path] = r.Old.Version
		}
		replacements[r.Old] = r.New
	}
	for i, m := range ms {
		mainModules.pathPrefix[m] = m.Path
		mainModules.modRoot[m] = rootDirs[i]
		mainModules.modFiles[m] = modFiles[i]

			first := parseModule(deps[0])
			second := parseModule(deps[1])
			if first.version == "" || first.version == "v0.0.0" {
				if !mainModules[first] {
					mainModules[first] = true
					mainModulesList = append(mainModulesList, first)
				}
			}
			modMap[first] = append(modMap[first], second)
		} else {
			// skip invalid line
			log.Printf("!!!invalid line in mod.graph: %s", line)
			continue
		}
	}

		for _, mainModule := range MainModules.Versions() {
			if MainModules.InGorootSrc(mainModule) {
				if dir, ok, err := dirInModule(path, MainModules.PathPrefix(mainModule), MainModules.ModRoot(mainModule), true); err != nil {
					return module.Version{}, MainModules.ModRoot(mainModule), dir, nil, err
				} else if ok {
					return mainModule, MainModules.ModRoot(mainModule), dir, nil, nil
				}
			}
		}

// list additional directives from the package under test.
func defaultGODEBUG(p *Package, directives, testDirectives, xtestDirectives []build.Directive) string {
	if p.Name != "main" {
		return ""
	}
	goVersion := modload.MainModules.GoVersion()
	if modload.RootMode == modload.NoRoot && p.Module != nil {
		// This is go install pkg@version or go run pkg@version.
		// Use the Go version from the package.
		// If there isn't one, then assume Go 1.20,

# Regression test for https://go.dev/issue/58767:
# with an empty go.work file in GOPATH mode, calls to load.defaultGODEBUG for a
# package named "main" panicked in modload.MainModules.GoVersion.

env GO111MODULE=off
cd example
go list example/m

-- example/go.work --
go 1.21
-- example/m/main.go --
package main