(package-scope instrumentation is enabled via "-pkgcfg" option).

When generated instrumented code, the cover tool computes approximate
basic block information by studying the source. It is thus more
portable than binary-rewriting coverage tools, but also a little less
capable. For instance, it does not probe inside && and || expressions,
and can be mildly confused by single statements with multiple function
literals.

				// versions older than what is listed in the go.mod file.
				compatVersion = goVersion
			}
		}
		if gover.Compare(compatVersion, goVersion) > 0 {
			// Each version of the Go toolchain knows how to interpret go.mod and
			// go.sum files produced by all previous versions, so a compatibility
			// version higher than the go.mod version adds nothing.
			compatVersion = goVersion
		}

// Implementation

func bindTParams(list []*TypeParam) *TypeParamList {
	if len(list) == 0 {
		return nil
	}
	for i, typ := range list {
		if typ.index >= 0 {
			panic("type parameter bound more than once")
		}
		typ.index = i
	}
	return &TypeParamList{tparams: list}

}

const (
	quiescent            = 10 * time.Millisecond
	probablyStillBlocked = 10 * time.Second
)

func mustBlock(t *testing.T, desc string, f func()) (wait func(*testing.T)) {
	t.Helper()

	done := make(chan struct{})
	go func() {
		f()
		close(done)
	}()

	timer := time.NewTimer(quiescent)
	defer timer.Stop()
	select {
	case <-done:
		t.Fatalf("%s unexpectedly did not block", desc)
	case <-timer.C:
	}

// system. That is, if on a Mac you do:
//
//	GOOS=linux GOARCH=ppc64 go build cmd/compile
//
// the resulting compiler will default to generating linux/ppc64 object files.
// This is more useful than having it default to generating objects for the
// original target (in this example, a Mac).
func mkbuildcfg(file string) {
	var buf strings.Builder
	writeHeader(&buf)
	fmt.Fprintf(&buf, "package buildcfg\n")

	//
	// While this format is compatible with most tar readers,
	// the format has several limitations making it unsuitable for some usages.
	// Most notably, it cannot support sparse files, files larger than 8GiB,
	// filenames larger than 256 characters, and non-ASCII filenames.
	//
	// Reference:
	//	http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
	FormatUSTAR

		if y, ok := y.(*Map); ok {
			return u.nify(x.key, y.key, emode, p) && u.nify(x.elem, y.elem, emode, p)
		}

	case *Chan:
		// Two channel types unify if their value types unify
		// and if they have the same direction.
		// The channel direction is ignored for inexact unification.
		if y, ok := y.(*Chan); ok {
			return (mode&exact == 0 || x.dir == y.dir) && u.nify(x.elem, y.elem, emode, p)
		}

	case *Named:

#
# a --- b

# So upgrading to a3 adds a dependency on b2,
# b2 adds a dependency on a2 (for "a/sub"),
# and a2 (but not a3) would add a dependency on c2.
# Since a2 is lower than a3 it cannot possibly be selected when
# upgrading to a3: normally a2 is pruned out of a3's module graph,
# so 'go get' should prune it out too, and c should remain at c1
# without error.

go get a@v0.3.0

go list -m c

	return err
}

// Peek returns the next n bytes without advancing the reader. The bytes stop
// being valid at the next read call. If Peek returns fewer than n bytes, it
// also returns an error explaining why the read is short. The error is
// [ErrBufferFull] if n is larger than b's buffer size.
//
// Calling Peek prevents a [Reader.UnreadByte] or [Reader.UnreadRune] call from succeeding
// until the next read operation.

[GOOS:ios] skip 'Lstat on ios does not conform to POSIX pathname resolution; see #59586'

# Ensure that the relative path to $WORK/lib/goroot/src from $PWD is a different
# number of ".." hops than the relative path to it from $WORK/share/goroot/src.

cd $WORK

# Construct a fake GOROOT in $WORK/lib/goroot whose src directory is a symlink
# to a subdirectory of $WORK/share. This mimics the directory structure reported