# 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

        val sharedBinaryDependencies = moduleStructure.binaryModules.toMutableSet()
        for (mainModule in moduleStructure.mainModules) {
            val ktModule = mainModule.ktModule
            if (ktModule !is KtBinaryModule) continue
            sharedBinaryDependencies -= ktModule
        }

        val mainBinaryRoots = StandaloneProjectFactory.getVirtualFilesForLibraryRoots(

# modules being checked for correct sums. Specifically this would happen when
# the module name sorted after the virtual 'go' version module name because
# it could not get chopped off when we removed the MainModules.Len() modules
# at the beginning of the build list and we would remove the go module instead.

go mod verify

-- go.work --
go 1.21

use (
    ./a
    ./b
)
-- a/go.mod --

			if inWorkspaceMode() {
				for _, m := range MainModules.Versions() {
					reqs, _ := rootsFromModFile(m, MainModules.ModFile(m), omitToolchainRoot)
					mg.g.Require(m, append(reqs, vendorMod))
				}
				mg.g.Require(vendorMod, vendorList)

			} else {
				mainModule := MainModules.mustGetSingleMainModule()
				mg.g.Require(mainModule, append(rs.rootModules, vendorMod))
				mg.g.Require(vendorMod, vendorList)

// with any exclusions or replacements applied internally.
type mvsReqs struct {
	roots []module.Version
}

func (r *mvsReqs) Required(mod module.Version) ([]module.Version, error) {
	if mod.Version == "" && MainModules.Contains(mod.Path) {
		// Use the build list as it existed when r was constructed, not the current
		// global build list.
		return r.roots, nil
	}

	if mod.Version == "none" {
		return nil, nil
	}

private fun getTestDataContext(testServices: TestServices): TestDataContext {
    var psiDeclaration: PsiElement? = null
    var useSitePosition: PsiElement? = null

    testServices.ktTestModuleStructure.mainModules.forEach { ktTestModule ->
        val psiFiles = ktTestModule.files
        for (psiFile in psiFiles) {
            val targetOffset = testServices.expressionMarkerProvider.getCaretPositionOrNull(psiFile)

		modload.LoadModFile(ctx) // to fill MainModules

		if haveExplicitArgs {
			for _, mainModule := range modload.MainModules.Versions() {
				targetAtUpgrade := mainModule.Path + "@upgrade"
				targetAtPatch := mainModule.Path + "@patch"
				for _, arg := range args {
					switch arg {
					case mainModule.Path, targetAtUpgrade, targetAtPatch:

    override fun doTest(testServices: TestServices) {
        val mainModule = testServices.ktTestModuleStructure.mainModules
            .let { modules -> if (modules.size == 1) modules.first() else fail("Expected single main module. Found $modules") }

        val libraryModule = mainModule.ktModule as? KtLibraryModule
            ?: fail("Expected main module '${mainModule.ktModule}' to be '${KtLibraryModule::class.simpleName}'")

            registerService(ModuleVisibilityManager::class.java, CliModuleVisibilityManagerImpl(enabled = true))
        }

        testServices.ktTestModuleStructure.mainModules.forEach { ktTestModule ->
            val sourceModule = ktTestModule.ktModule as? KtSourceModule ?: return@forEach
            AnalysisHandlerExtension.registerExtension(project, KaFe10AnalysisHandlerExtension(sourceModule))

	// It's not strictly necessary but helpful to keep the checks.
	var pkgNotFoundErr error
	pkgNotFoundLongestPrefix := ""
	for _, mainModule := range MainModules.Versions() {
		modRoot := MainModules.ModRoot(mainModule)
		if modRoot != "" && str.HasFilePathPrefix(absDir, modRoot) && !strings.Contains(absDir[len(modRoot):], "@") {
			suffix := filepath.ToSlash(str.TrimFilePathPrefix(absDir, modRoot))