if _, ok, err := dirInModule(pkg, mainModulePrefix, modRoot, true); err != nil {
				return "", err
			} else if !ok {
				// This main module could contain the directory but doesn't. Other main
				// modules might contain the directory, so wait till we finish the loop
				// to see if another main module contains directory. But if not,
				// return an error.
				if len(mainModulePrefix) > len(pkgNotFoundLongestPrefix) {

//		library that will be used when building with the -linkshared
//		option. Packages named main are ignored.
//
//	-buildmode=exe
//		Build the listed main packages and everything they import into
//		executables. Packages not named main are ignored.
//
//	-buildmode=pie
//		Build the listed main packages and everything they import into

	if err != nil {
		base.Errorf("go: %s: %v", p.Dir, err)
		return
	}

	sh := work.NewShell("", fmt.Print)

	packageFile := map[string]bool{}
	if p.Name != "main" {
		// Record which files are not in package main.
		// The others are.
		keep := func(list []string) {
			for _, f := range list {
				packageFile[f] = true
			}
		}
		keep(p.GoFiles)
		keep(p.CgoFiles)

		check.error(ident, InvalidInitDecl, "cannot declare init - must be func")
		return
	}

	// spec: "The main package must have package name main and declare
	// a function main that takes no arguments and returns no value."
	if ident.Value == "main" && check.pkg.name == "main" {
		check.error(ident, InvalidMainDecl, "cannot declare main - must be func")
		return
	}

	check.declare(check.pkg.scope, ident, obj, nopos)

}

// HasModRoot reports whether a main module is present.
// HasModRoot may return false even if Enabled returns true: for example, 'get'
// does not require a main module.
func HasModRoot() bool {
	Init()
	return modRoots != nil
}

// MustHaveModRoot checks that a main module or main modules are present,
// and calls base.Fatalf if there are no main modules.
func MustHaveModRoot() {
	Init()

		}
	}

	return buf.String()
}

// A DirectImportFromImplicitDependencyError indicates a package directly
// imported by a package or test in the main module that is satisfied by a
// dependency that is not explicit in the main module's go.mod file.
type DirectImportFromImplicitDependencyError struct {
	ImporterPath string
	ImportedPath string
	Module       module.Version
}

// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"fmt"
	"strings"
)

/*
 * Helpers for building runtime.
 */

// mkzversion writes zversion.go:
//
//	package sys
//
// (Nothing right now!)
func mkzversion(dir, file string) {
	var buf strings.Builder
	writeHeader(&buf)

	tg.tempFile("src/main1/main.go", "package main\nimport _ \"p2\"\nfunc main() {}\n")

	tg.run("list", "-f={{.Target}}", "p1")
	p1 := strings.TrimSpace(tg.getStdout())
	tg.run("list", "-f={{.Target}}", "p2")
	p2 := strings.TrimSpace(tg.getStdout())
	tg.run("list", "-f={{.Target}}", "main1")
	main1 := strings.TrimSpace(tg.getStdout())

	tg.run("install", "main1")

	tg.mustExist(main1)

}

// addTransitiveLinkDeps adds to the link action a all packages
// that are transitive dependencies of a1.Deps.
// That is, if a is a link of package main, a1 is the compile of package main
// and a1.Deps is the actions for building packages directly imported by
// package main (what the compiler needs). The linker needs all packages
// transitively imported by the whole program; addTransitiveLinkDeps
// makes sure those are present in a.Deps.

// and reports whether the effective value differs from GOCACHE.
func DefaultDir() (string, bool) {
	// Save the result of the first call to DefaultDir for later use in
	// initDefaultCache. cmd/go/main.go explicitly sets GOCACHE so that
	// subprocesses will inherit it, but that means initDefaultCache can't
	// otherwise distinguish between an explicit "off" and a UserCacheDir error.

	defaultDirOnce.Do(func() {