return !strings.HasPrefix(p, ".") && (!strings.HasPrefix(p, "_") || !strings.HasSuffix(p, ".go"))
	})

	// Add generated files for this package.
	for _, gt := range gentab {
		if gt.pkg == pkg {
			files = append(files, gt.file)
		}
	}
	files = uniq(files)

	// Convert to absolute paths.
	for i, p := range files {
		if !filepath.IsAbs(p) {
			files[i] = pathf("%s/%s", dir, p)

	// order of the files, only on the presentation order to
	// the type-checker.
	for _, test := range []struct {
		files []*syntax.File
		want  string
	}{
		{[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
		{[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
	} {
		var info Info
		if _, err := new(Config).Check("main", test.files, &info); err != nil {
			t.Fatal(err)
		}

'Go test' recompiles each package along with any files with names matching
the file pattern "*_test.go".
These additional files can contain test functions, benchmark functions, fuzz
tests and example functions. See 'go help testfunc' for more.
Each listed package causes the execution of a separate test binary.
Files whose names begin with "_" (including "_test.go") or "." are ignored.

	//
	// We look for non-hidden .go files or subdirectories to determine whether
	// this is an existing project. Walking the tree for packages would be more
	// accurate, but could take much longer.
	empty := true
	files, _ := os.ReadDir(modRoot)
	for _, f := range files {
		name := f.Name()
		if strings.HasPrefix(name, ".") || strings.HasPrefix(name, "_") {

			if err != nil {
				ld.error(err)
				ld.exitIfErrors(ctx)
			}
		}

		// If the module's Go version omits go.sum entries for go.mod files for test
		// dependencies of external packages, avoid loading those files in the first
		// place.
		ld.skipImportModFiles = ld.Tidy && gover.Compare(goVersion, gover.TidyGoModSumVersion) < 0

			// other module depends on the main module, and that other module also
			// uses a pruned module graph, it will expect to find all of our
			// transitive dependencies by reading just our go.mod file, not the go.mod
			// files of everything we depend on.
			//
			// (This is the “import invariant” that makes graph pruning possible.)

		case rootsImported && pkg.flags.has(pkgFromRoot):

		if n.Kind == "type" && typedef[n.Mangle] == nil {
			typedef[n.Mangle] = n.Type
		}
	}
}

// mangleName does name mangling to translate names
// from the original Go source files to the names
// used in the final Go files generated by cgo.
func (p *Package) mangleName(n *Name) {
	// When using gccgo variables have to be
	// exported so that they become global symbols
	// that the C code can refer to.
	prefix := "_C"

//	Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

//	Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

			} else {
				extraFiles = append(extraFiles, path)
			}
			return nil
		})
		if err != nil {
			log.Fatal(err)
		}

		if len(extraFiles) > 0 {
			log.Fatalf("unexpected files left in tmpdir: %q", extraFiles)
		} else if len(extraDirs) > 0 {
			log.Fatalf("unexpected subdirectories left in tmpdir: %q", extraDirs)
		}

		removeAll(topTmpdir)
	}

	os.Exit(r)
}