m := make(map[string]*goDirPkg)
	for _, file := range files {
		name := file.Name()
		pkgname, err := getPackageNameFromSource(filepath.Join(dir, name))
		if err != nil {
			t.Fatal(err)
		}
		p, ok := m[pkgname]
		if singlefilepkgs || !ok {
			p = &goDirPkg{name: pkgname}
			pkgs = append(pkgs, p)
			m[pkgname] = p
		}
		p.files = append(p.files, name)
	}
	return pkgs
}

			var pkgname string
			if pnSymIdx := d.ldr.Lookup(dwarf.CUInfoPrefix+"packagename."+unit.Lib.Pkg, 0); pnSymIdx != 0 {
				pnsData := d.ldr.Data(pnSymIdx)
				pkgname = string(pnsData)
			}
			newattr(unit.DWInfo, dwarf.DW_AT_go_package_name, dwarf.DW_CLS_STRING, int64(len(pkgname)), pkgname)

			// Scan all functions in this compilation unit, create

		}
	}
	return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
}

func mustTypecheck(src string, conf *Config, info *Info) *Package {
	pkg, err := typecheck(src, conf, info)
	if err != nil {
		panic(err) // so we don't need to pass *testing.T
	}
	return pkg
}

// pkgName extracts the package name from src, which must contain a package header.
func pkgName(src string) string {
	const kw = "package "

	// Hand the Go files to the compiler en masse.
	// For packages containing assembly, this writes go_asm.h, which
	// the assembly files will need.
	pkgName := pkg
	if strings.HasPrefix(pkg, "cmd/") && strings.Count(pkg, "/") == 1 {
		pkgName = "main"
	}
	b := pathf("%s/_go_.a", workdir)
	clean = append(clean, b)
	if !ispackcmd {
		link = append(link, b)
	} else {
		archive = b
	}

	pkg, err := typecheck(src, conf, info)
	if err != nil {
		panic(err) // so we don't need to pass *testing.T
	}
	return pkg
}

// pkgName extracts the package name from src, which must contain a package header.
func pkgName(src string) string {
	const kw = "package "
	if i := strings.Index(src, kw); i >= 0 {
		after := src[i+len(kw):]
		n := len(after)

		// go.codereview/patch tests.
		// For package names containing those words, use test.test.exe
		// instead of pkgname.test.exe.
		// Note that this file name is only used in the Go command's
		// temporary directory. If the -c or other flags are
		// given, the code below will still use pkgname.test.exe.
		// There are two user-visible effects of this change.
		// First, you can actually run 'go test' in directories that

	// PackageClause
	f.GoVersion = p.goVersion
	p.top = false
	if !p.got(_Package) {
		p.syntaxError("package statement must be first")
		return nil
	}
	f.Pragma = p.takePragma()
	f.PkgName = p.name()
	p.want(_Semi)

	// don't bother continuing if package clause has errors
	if p.first != nil {
		return nil
	}

	// Accept import declarations anywhere for error tolerance, but complain.