// return the same package.
	ImportFrom(path, dir string, mode ImportMode) (*Package, error)
}

// A Config specifies the configuration for type checking.
// The zero value for Config is a ready-to-use default configuration.
type Config struct {
	// Context is the context used for resolving global identifiers. If nil, the
	// type checker will initialize this field with a newly created context.
	Context *Context

	objdirSeq int // counter for NewObjdir
	pkgSeq    int

	backgroundSh *Shell // Shell that per-Action Shells are derived from

	exec      sync.Mutex
	readySema chan bool
	ready     actionQueue

	id           sync.Mutex
	toolIDCache  map[string]string // tool name -> tool ID
	buildIDCache map[string]string // file name -> build ID
}

		// Assignments can only alias with direct uses of this variable.
		assigned.Add(name)
	}

	early.Append(late.Take()...)
	return early
}

// readsMemory reports whether the evaluation n directly reads from
// memory that might be written to indirectly.
func readsMemory(n ir.Node) bool {
	switch n.Op() {
	case ir.ONAME:
		n := n.(*ir.Name)
		if n.Class == ir.PFUNC {
			return false
		}

		if rmErr := os.RemoveAll(dir); err == nil {
			err = rmErr
		}
	}()

	localGitRepo = filepath.Join(dir, "gitrepo2")

	// Redirect the module cache to a fresh directory to avoid crosstalk, and make
	// it read/write so that the test can still clean it up easily when done.
	cfg.GOMODCACHE = filepath.Join(dir, "modcache")
	cfg.ModCacheRW = true

	m.Run()
	return nil
}

// symbol names.
func (s *SymABIs) canonicalize(linksym string) string {
	if strings.HasPrefix(linksym, `"".`) {
		panic("non-canonical symbol name: " + linksym)
	}
	return linksym
}

// ReadSymABIs reads a symabis file that specifies definitions and
// references of text symbols by ABI.
//
// The symabis format is a set of lines, where each line is a sequence
// of whitespace-separated fields. The first field is a verb and is

// gives access to the comparison operation.
//
// It must be safe to call methods on a Reqs from multiple goroutines simultaneously.
// Because a Reqs may read the underlying graph from the network on demand,
// the MVS algorithms parallelize the traversal to overlap network delays.
type Reqs interface {
	// Required returns the module versions explicitly required by m itself.

				// Schedule flag register generation as late as possible.
				// This makes sure that we only have one live flags
				// value at a time.
				// Note that this case is after the case above, so values
				// which both read and generate flags are given ScoreReadFlags.
				score[v.ID] = ScoreFlags
			default:
				score[v.ID] = ScoreDefault
				// If we're reading flags, schedule earlier to keep flag lifetime short.

		return r[i].offset < r[j].offset
	})

	// Check that we have contiguous offsets.
	for i := int64(0); i < n; i++ {
		if r[i].offset != r[0].offset+i*size {
			return false
		}
	}

	// Check for reads in little-endian or big-endian order.
	shift0 := r[0].shift
	isLittleEndian := true
	for i := int64(0); i < n; i++ {
		if r[i].shift != shift0+i*size*8 {
			isLittleEndian = false
			break
		}
	}

	cmdline := str.StringList(cmdargs...)

	for _, arg := range cmdline {
		// GNU binutils commands, including gcc and gccgo, interpret an argument
		// @foo anywhere in the command line (even following --) as meaning
		// "read and insert arguments from the file named foo."
		// Don't say anything that might be misinterpreted that way.
		if strings.HasPrefix(arg, "@") {

		"-o", outf}
	lines := runToolOp(t, s, "textfmt", dargs)

	// No output expected.
	if len(lines) != 0 {
		dumplines(lines)
		t.Errorf("unexpected output from go tool covdata textfmt")
	}

	// Open and read the first few bits of the file.
	payload, err := os.ReadFile(outf)
	if err != nil {
		t.Errorf("opening %s: %v\n", outf, err)
	}
	lines = strings.Split(string(payload), "\n")
	want0 := "mode: set"