}
	// Simple test to make sure PAX extensions are in effect
	if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
		t.Fatal("Expected at least one PAX header to be written.")
	}
	// Test that we can get a long name back out of the archive.
	reader := NewReader(&buf)
	hdr, err = reader.Next()
	if err != nil {
		t.Fatal(err)
	}
	if hdr.Name != longName {
		t.Fatal("Couldn't recover long file name")
	}
}

	srcArch.AddPrefix("go")
	testSrc(srcArch)

	// The binary distribution includes only a subset of bin and pkg.
	binArch := base.Clone()
	binArch.Filter(func(name string) bool {
		// Discard bin/ for now, will add back later.
		if strings.HasPrefix(name, "bin/") {
			return false
		}
		// Discard most of pkg.
		if strings.HasPrefix(name, "pkg/") {
			// Keep pkg/include.
			if strings.HasPrefix(name, "pkg/include/") {

	// explanation why GOPATH is unset.
	GoPathError   string
	GOPATHChanged bool
	CGOChanged    bool
)

func defaultContext() build.Context {
	ctxt := build.Default

	ctxt.JoinPath = filepath.Join // back door to say "do not use go command"

	// Override defaults computed in go/build with defaults
	// from go environment configuration file, if known.
	ctxt.GOPATH, GOPATHChanged = EnvOrAndChanged("GOPATH", gopath(ctxt))

// function, a bit like a closure, with its own ODCLFUNC.
// The OMETHVALUE uses n.Func to record the linkage to
// the generated ODCLFUNC, but there is no
// pointer from the Func back to the OMETHVALUE.
type Func struct {
	miniNode
	Body Nodes

	Nname    *Name        // ONAME node
	OClosure *ClosureExpr // OCLOSURE node

	// ONAME nodes for all params/locals for this func/closure, does NOT

	typecheck.DeclFunc(fn)

	fn.SetABIWrapper(true)
	fn.SetDupok(true)

	// ABI0-to-ABIInternal wrappers will be mainly loading params from
	// stack into registers (and/or storing stack locations back to
	// registers after the wrapped call); in most cases they won't
	// need to allocate stack space, so it should be OK to mark them
	// as NOSPLIT in these cases. In addition, my assumption is that

		// CannotInferTypeArgs indicates a failure of inference, though the actual
		// error may be better attributed to a user-provided type argument (hence
		// InvalidTypeArg). We can't differentiate these cases, so fall back on
		// the more general CannotInferTypeArgs.
		if inferred != tpar {
			if reverse {
				err.addf(arg, "inferred type %s for %s does not match type %s of %s", inferred, tpar, targ, arg.expr)
			} else {

	}
	return p, pkgerr
}

// IsStandardPackage reports whether path is a standard package
// for the goroot and compiler using the module index if possible,
// and otherwise falling back to internal/goroot.IsStandardPackage
func IsStandardPackage(goroot_, compiler, path string) bool {
	if !enabled || compiler != "gc" {
		return goroot.IsStandardPackage(goroot_, compiler, path)
	}

	n, err = C.sqrt(-1)
	_, err := C.voidFunc()
	var n, err = C.sqrt(1)

Calling C function pointers is currently not supported, however you can
declare Go variables which hold C function pointers and pass them
back and forth between Go and C. C code may call function pointers
received from Go. For example:

	package main

	// typedef int (*intFunc) ();
	//
	// int
	// bridge_int_func(intFunc f)
	// {

	// If rbase is t, then origm is already the instantiated method we're looking
	// for. In this case, we return origm to preserve the invariant that
	// traversing Method->Receiver Type->Method should get back to the same
	// method.
	//
	// This occurs if t is instantiated with the receiver type parameters, as in
	// the use of m in func (r T[_]) m() { r.m() }.
	if rbase == t {
		return origm
	}

	// Note: for both Const32F and Const64F, we disallow encoding NaNs.
	// Signaling NaNs are tricky because if you do anything with them, they become quiet.
	// Particularly, converting a 32 bit sNaN to 64 bit and back converts it to a qNaN.
	// See issue 36399 and 36400.
	// Encodings of +inf, -inf, and -0 are fine.
	{name: "Const32F", aux: "Float32"}, // value is math.Float64frombits(uint64(auxint)) and is exactly representable as float 32