"os"
	"os/exec"
	"slices"
	"strings"
	"syscall"
	"testing"
)

func TestGoBuildUmask(t *testing.T) {
	// Do not use tg.parallel; avoid other tests seeing umask manipulation.
	mask := syscall.Umask(0077) // prohibit low bits
	defer syscall.Umask(mask)

	tg := testgo(t)
	defer tg.cleanup()
	tg.tempFile("x.go", `package main; func main() {}`)

	// We have set a umask, but if the parent directory happens to have a default

// only makes sense, though, if the performance and/or space penalty of using
// the generic breaker is big. Extra data will only be needed for non-cased
// runes, which means there are sufficient bits left in the caseType.
// ICU prohibits breaking in such cases as well.

// For the purpose of title casing we use an approximation of the Unicode Word
// Breaking algorithm defined in Annex #29:
// https://www.unicode.org/reports/tr29/#Default_Grapheme_Cluster_Table.

			funcs[fn] = nowritebarrierrecCall{}
			q.PushRight(fn.Nname)
		}
		// Check go:nowritebarrier functions.
		if fn.Pragma&ir.Nowritebarrier != 0 && fn.WBPos.IsKnown() {
			base.ErrorfAt(fn.WBPos, 0, "write barrier prohibited")
		}
	}

	// Perform a BFS of the call graph from all
	// go:nowritebarrierrec functions.
	enqueue := func(src, target *ir.Func, pos src.XPos) {
		if target.Pragma&ir.Yeswritebarrierrec != 0 {

	return l.r.Zip(ctx, dst, version)
}

// errRepo is a Repo that returns the same error for all operations.
//
// It is useful in conjunction with caching, since cache hits will not attempt
// the prohibited operations.
type errRepo struct {
	modulePath string
	err        error
}

func (r errRepo) ModulePath() string { return r.modulePath }

		// for those operations seems worth the benefit of picking up more accurate
		// versions.
		//
		// Fall back to this resolution scheme only if the GOPROXY setting prohibits
		// us from resolving upstream tags.
		if cfg.GOPROXY == "off" {
			if file, info, err := readDiskStatByHash(ctx, path, rev); err == nil {
				return file, info, nil
			}
		}
		return file, nil, err
	}