// An untyped nil does not need a pointer check, and when
	// _cgoCheckPointer returns the untyped nil the type assertion we
	// are going to insert will fail.  Easier to just skip nil arguments.
	// TODO: Note that this fails if nil is shadowed.
	if id, ok := arg.(*ast.Ident); ok && id.Name == "nil" {
		return false
	}

	return p.hasPointer(f, t, true)
}

		if _, err := fsys.Stat(absDir); err != nil {
			if os.IsNotExist(err) {
				// Canonicalize OS-specific errors to errDirectoryNotFound so that error
				// messages will be easier for users to search for.
				return "", &fs.PathError{Op: "stat", Path: absDir, Err: errDirectoryNotFound}
			}
			return "", err
		}
		if _, noGo := err.(*build.NoGoError); noGo {

func Madvise(b []byte, advice int) (err error) {
	return
}

func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
	return mapper.Mmap(fd, offset, length, prot, flags)
}

func Munmap(b []byte) (err error) {
	return mapper.Munmap(b)
}

//sys   Gethostname(buf []byte) (err error) = SYS___GETHOSTNAME_A
//sysnb	Getgid() (gid int)
//sysnb	Getpid() (pid int)

// Inferno utils/5l/span.c
// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/5l/span.c
//
//	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
//	Portions Copyright © 1995-1997 C H Forsyth (******@****.***)
//	Portions Copyright © 1997-1999 Vita Nuova Limited
//	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
//	Portions Copyright © 2004,2006 Bruce Ellis

// Inferno utils/8l/asm.c
// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/8l/asm.c
//
//	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
//	Portions Copyright © 1995-1997 C H Forsyth (******@****.***)
//	Portions Copyright © 1997-1999 Vita Nuova Limited
//	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
//	Portions Copyright © 2004,2006 Bruce Ellis

		syms = append(syms, s)

		// Create auxiliary entry

		// Normally, size should be the size of csect containing all
		// the data and bss symbols of one file/package.
		// However, it's easier to just have a csect for each symbol.
		// It might change
		size := uint64(ldr.SymSize(x))
		a4 := &XcoffAuxCSect64{
			Xauxtype:  _AUX_CSECT,
			Xscnlenlo: uint32(size & 0xFFFFFFFF),

	}

	// Toolchain2 should be semantically equivalent to toolchain1,
	// but it was built using the newly built compiler instead of the Go bootstrap compiler,
	// so it should at the least run faster. Also, toolchain1 had no build IDs
	// in the binaries, while toolchain2 does. In non-release builds, the
	// toolchain's build IDs feed into constructing the build IDs of built targets,

			continue
		}
		path := req.Path
		old := r.initialVersion[path]
		new := req.Version
		if old != new {
			changes[path] = change{path, old, new}
		}
	}

	// Toolchain diffs are easier than requirements: diff old and new directly.
	toolchainVersions := func(reqs []module.Version) (goV, toolchain string) {
		for _, req := range reqs {
			if req.Path == "go" {
				goV = req.Version
			}

	a.Value = value
	a.Data = data
}

// Each DIE (except the root ones) has at least 1 attribute: its
// name. getattr moves the desired one to the front so
// frequently searched ones are found faster.
func getattr(die *dwarf.DWDie, attr uint16) *dwarf.DWAttr {
	if die.Attr.Atr == attr {
		return die.Attr
	}

	a := die.Attr
	b := a.Link
	for b != nil {
		if b.Atr == attr {
			a.Link = b.Link

	tg := testgo(t)
	defer tg.cleanup()
	tg.parallel()
	tg.makeTempdir()
	tg.setenv("GOPATH", tg.tempdir)
	tg.setenv("GOCACHE", tg.path("cache"))

	// The -p=1 in the commands below just makes the -x output easier to read.

	t.Log("\n\nINITIAL\n\n")

	tg.tempFile("src/p1/p1.go", "package p1\nvar X =  1\n")
	tg.tempFile("src/p2/p2.go", "package p2\nimport _ \"p1\"\nvar X = 1\n")