newImport.EndPos = pos

	// Clean up parens. impDecl contains at least one spec.
	if len(impDecl.Specs) == 1 {
		// Remove unneeded parens.
		impDecl.Lparen = token.NoPos
	} else if !impDecl.Lparen.IsValid() {
		// impDecl needs parens added.
		impDecl.Lparen = impDecl.Specs[0].Pos()
	}

	f.Imports = append(f.Imports, newImport)

	if len(f.Decls) <= 1 {
		return true
	}

	//
	TypeAssertExpr struct {
		X      Expr      // expression
		Lparen token.Pos // position of "("
		Type   Expr      // asserted type; nil means type switch X.(type)
		Rparen token.Pos // position of ")"
	}

	// A CallExpr node represents an expression followed by an argument list.
	CallExpr struct {
		Fun      Expr      // function expression
		Lparen   token.Pos // position of "("

		copy(f.Decls[lastImport+2:], f.Decls[lastImport+1:])
		f.Decls[lastImport+1] = impDecl
	}

	// Ensure the import decl has parentheses, if needed.
	if len(impDecl.Specs) > 0 && !impDecl.Lparen.IsValid() {
		impDecl.Lparen = impDecl.Pos()
	}

	insertAt := impIndex + 1
	if insertAt == 0 {
		insertAt = len(impDecl.Specs)
	}
	impDecl.Specs = append(impDecl.Specs, nil)

	for _, d := range file.Decls {
		d, ok := d.(*ast.GenDecl)
		if !ok || d.Tok != token.IMPORT {
			// Not an import declaration, so we're done.
			// Imports are always first.
			return false
		}
		if d.Lparen.IsValid() {
			// For now assume all grouped imports are unsorted.
			// TODO(gri) Should check if they are sorted already.
			return true
		}
		// Ungrouped imports are sorted by default.
	}
	return false

	//     29  .  .  .  .  .  .  .  Fun: *ast.Ident {
	//     30  .  .  .  .  .  .  .  .  NamePos: 4:2
	//     31  .  .  .  .  .  .  .  .  Name: "println"
	//     32  .  .  .  .  .  .  .  }
	//     33  .  .  .  .  .  .  .  Lparen: 4:9
	//     34  .  .  .  .  .  .  .  Args: []ast.Expr (len = 1) {
	//     35  .  .  .  .  .  .  .  .  0: *ast.BasicLit {
	//     36  .  .  .  .  .  .  .  .  .  ValuePos: 4:10

			if d.Doc != nil {
				comments = append(comments, d.Doc)
			}
		}
	}

	// Synthesize import declaration.
	importDecl := &ast.GenDecl{
		Tok:    token.IMPORT,
		Lparen: 1, // Need non-zero Lparen and Rparen so that printer
		Rparen: 1, // treats this as a factored import.
	}
	importDecl.Specs = append(namedImports, blankImports...)

	// Synthesize main function.
	funcDecl := &ast.FuncDecl{

	for _, d := range f.Decls {
		d, ok := d.(*GenDecl)
		if !ok || d.Tok != token.IMPORT {
			// Not an import declaration, so we're done.
			// Imports are always first.
			break
		}

		if !d.Lparen.IsValid() {
			// Not a block: sorted by default.
			continue
		}

		// Identify and sort runs of specs on successive lines.
		i := 0
		specs := d.Specs[:0]
		for j, s := range d.Specs {

	if err != nil {
		t.Errorf("%v\norig: %q\ngot : %q", err, src, got)
	}
}

// If a declaration has multiple specifications, a parenthesized
// declaration must be printed even if Lparen is token.NoPos.
func TestParenthesizedDecl(t *testing.T) {
	// a package with multiple specs in a single declaration
	const src = "package p; var ( a float64; b int )"
	fset := token.NewFileSet()

		}

		// A call to C.CBytes passes a pointer but is always safe.
		if name == "CBytes" {
			return true
		}

		if debug {
			log.Printf("%s: call to C.%s", fset.Position(call.Lparen), name)
		}

		for _, arg := range call.Args {
			if !typeOKForCgoCall(cgoBaseType(info, arg), make(map[types.Type]bool)) {
				reportf(arg.Pos(), "possibly passing Go type with embedded pointer to C")
				break
			}

	if idx < 0 {
		if false {
			pass.Reportf(call.Lparen, "can't check non-constant format in call to %s", fn.FullName())
		}
		return
	}

	firstArg := idx + 1 // Arguments are immediately after format string.
	if !strings.Contains(format, "%") {
		if len(call.Args) > firstArg {
			pass.Reportf(call.Lparen, "%s call has arguments but no formatting directives", fn.FullName())
		}
		return
	}