testenv.MustHaveGoBuild(t) // The Go command is needed for the importer to determine the locations of stdlib .a files.

	fset := token.NewFileSet()
	files, err := pkgFiles(fset, ".")
	if err != nil {
		t.Fatal(err)
	}

	conf := Config{Importer: importer.Default()}
	_, err = conf.Check("go/types", fset, files, nil)
	if err != nil {
		t.Fatal(err)
	}
}

func BenchmarkCheck(b *testing.B) {

		t.Error(pvagenfile + " is out of date")
	}

}

func pvagenerate(t *testing.T) string {
	var fset token.FileSet
	f, err := parser.ParseFile(&fset, "./dwarf.go", nil, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}
	cm := ast.NewCommentMap(&fset, f, f.Comments)
	abbrevs := make(map[string]int)
	funcs := map[string]ast.Stmt{}
	for _, decl := range f.Decls {

			lastSpec := d.Specs[len(d.Specs)-1]
			lastLine := lineAt(fset, lastSpec.Pos())
			rParenLine := lineAt(fset, d.Rparen)
			for rParenLine > lastLine+1 {
				rParenLine--
				fset.File(d.Rparen).MergeLine(rParenLine)
			}
		}
	}
}

func lineAt(fset *token.FileSet, pos token.Pos) int {
	return fset.PositionFor(pos, false).Line
}

func importPath(s Spec) string {

	nfiles  int // number of files processed
)

func gofmt(fset *token.FileSet, filename string, src *bytes.Buffer) error {
	f, _, _, err := parse(fset, filename, src.Bytes(), false)
	if err != nil {
		return err
	}
	ast.SortImports(fset, f)
	src.Reset()
	return (&printer.Config{Mode: printerMode, Tabwidth: tabWidth}).Fprint(src, fset, f)
}

func testFile(t *testing.T, b1, b2 *bytes.Buffer, filename string) {

	SRD	R14, R15, R6		// Clear the lower (8-len) bytes
	SRD	R14, R16, R9
#ifdef GOARCH_ppc64le
	ISEL	CR1LT, R7, R6, R8      // Choose the correct len bytes to compare based on alignment
	ISEL	CR0LT, R17, R9, R4
#else
	ISEL	CR1LT, R6, R7, R8
	ISEL	CR0LT, R9, R17, R4
#endif
	CMP	R4, R8
	ISEL	CR0EQ, R11, R0, R3
	RET

	src := `
package main
func main() {
	println("Hello, World!")
}
`

	// Create the AST by parsing src.
	fset := token.NewFileSet() // positions are relative to fset
	f, err := parser.ParseFile(fset, "", src, 0)
	if err != nil {
		panic(err)
	}

	// Print the AST.
	ast.Print(fset, f)

	// Output:
	//      0  *ast.File {
	//      1  .  Package: 2:1
	//      2  .  Name: *ast.Ident {

	return b.cfg
}

func (b *Block) String() string {
	return fmt.Sprintf("block %d (%s)", b.Index, b.comment(nil))
}

func (b *Block) comment(fset *token.FileSet) string {
	s := b.Kind.String()
	if fset != nil && b.Stmt != nil {
		s = fmt.Sprintf("%s@L%d", s, fset.Position(b.Stmt.Pos()).Line)
	}
	return s
}

// Return returns the return statement at the end of this block if present, nil
// otherwise.
//

// set.
//
// The meaning of the parameters fset, pkg, and pos is the
// same as in [CheckExpr]. An error is returned if expr cannot
// be parsed successfully, or the resulting expr AST cannot be
// type-checked.
func Eval(fset *token.FileSet, pkg *Package, pos token.Pos, expr string) (_ TypeAndValue, err error) {
	// parse expressions
	node, err := parser.ParseExprFrom(fset, "eval", expr, 0)
	if err != nil {

	var fset *token.FileSet
	var qf Qualifier
	if check != nil {
		fset = check.fset
		qf = check.qualifier
	}
	return sprintf(fset, qf, false, format, args...)
}

func (check *Checker) trace(pos token.Pos, format string, args ...any) {
	fmt.Printf("%s:\t%s%s\n",
		check.fset.Position(pos),
		strings.Repeat(".  ", check.indent),
		sprintf(check.fset, check.qualifier, true, format, args...),
	)

	}
}

func TestEvalBasic(t *testing.T) {
	fset := token.NewFileSet()
	for _, typ := range Typ[Bool : String+1] {
		testEval(t, fset, nil, nopos, typ.Name(), typ, "", "")
	}
}

func TestEvalComposite(t *testing.T) {
	fset := token.NewFileSet()
	for _, test := range independentTestTypes {
		testEval(t, fset, nil, nopos, test.src, nil, test.str, "")
	}
}

func TestEvalArith(t *testing.T) {