// which phases to dump IR before/after, etc.
	if f.Log() {
		f.Logf("compiling %s\n", f.Name)
	}

	var rnd *rand.Rand
	if checkEnabled {
		seed := int64(crc32.ChecksumIEEE(([]byte)(f.Name))) ^ int64(checkRandSeed)
		rnd = rand.New(rand.NewSource(seed))
	}

	// hook to print function & phase if panic happens
	phaseName := "init"
	defer func() {
		if phaseName != "" {
			err := recover()

	}
	return nil
}

type shuffleFlag struct {
	on   bool
	seed *int64
}

func (f *shuffleFlag) String() string {
	if !f.on {
		return "off"
	}
	if f.seed == nil {
		return "on"
	}
	return fmt.Sprintf("%d", *f.seed)
}

func (f *shuffleFlag) Set(value string) error {
	if value == "off" {
		*f = shuffleFlag{on: false}
		return nil

	for _, tt := range newerToolchainTests {
		out, err := newerToolchain(tt.need, tt.list)
		if (err != nil) != (out == "") {
			t.Errorf("newerToolchain(%v, %v) = %v, %v, want error", tt.need, tt.list, out, err)
			continue
		}
		if out != tt.out {
			t.Errorf("newerToolchain(%v, %v) = %v, %v want %v, nil", tt.need, tt.list, out, err, tt.out)
		}
	}
}

var f = strings.Fields

// Starting in Go 1.20, the global rand is auto-seeded,
// with a better value than the current Unix nanoseconds.
// Only seed if we're using older versions of Go.

//go:build !go1.20

package main

import (
	"math/rand"
	"time"
)

func init() {
	rand.Seed(time.Now().UnixNano())

	t.Run("PATH reminder", func(t *testing.T) {
		var want string
		switch gorootBin := filepath.Join(goroot, "bin"); runtime.GOOS {
		default:
			want = fmt.Sprintf("*** You need to add %s to your PATH.", gorootBin)
		case "plan9":
			want = fmt.Sprintf("*** You need to bind %s before /bin.", gorootBin)
		}
		if got := stdout.String(); !strings.Contains(got, want) {
			t.Errorf("reminder %q is missing from %s stdout:\n%s", want, makeScript, got)

	// There is a bit of a chicken-and-egg problem here: ideally we need to know
	// which Go version to switch to to download the requested modules, but if we
	// haven't downloaded the module's go.mod file yet the GoVersion field of its
	// info struct is not yet populated.
	//
	// We also need to be careful to only print the info for each module once
	// if the -json flag is set.
	//

//     as a type constraint in Go code
//   - if T is an uninstantiated generic type
func AssertableTo(V *Interface, T Type) bool {
	// Checker.newAssertableTo suppresses errors for invalid types, so we need special
	// handling here.
	if !isValid(T.Underlying()) {
		return false
	}
	return (*Checker)(nil).newAssertableTo(nopos, V, T, nil)
}

// AssignableTo reports whether a value of type V is assignable to a variable

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Metadata prints basic system metadata to include in test logs. This is
// separate from cmd/dist so it does not need to build with the bootstrap
// toolchain.

// This program is only used by cmd/dist. Add an "ignore" build tag so it
// is not installed. cmd/dist does "go run main.go" directly.

//go:build ignore

package main

			}
			continue
		}

		mustSelectVersion[r.Path] = r.Version
		selectedRoot[r.Path] = r.Version
	}

	// We've indexed all of the data we need and we've computed the initial
	// versions of the roots. Now we need to load the actual module graph and
	// restore the invariant that every root is the selected version of its path.
	//

	// The notes alone are not enough to prove the inconsistency.
	// We also need to show that the newer note's tree hash for older.N
	// does not match older.Hash. The consumer of this report could
	// of course consult the server to try to verify the inconsistency,
	// but we are holding all the bits we need to prove it right now,
	// so we might as well print them and make the report not depend