var buf bytes.Buffer
		noSourceConf.Fprint(&buf, fset, def.Go)
		if bytes.HasPrefix(buf.Bytes(), []byte("_Ctype_")) ||
			strings.HasPrefix(name, "_Ctype_enum_") ||
			strings.HasPrefix(name, "_Ctype_union_") {
			// This typedef is of the form `typedef a b` and should be an alias.
			fmt.Fprintf(fgo2, "= ")
		}
		fmt.Fprintf(fgo2, "%s", buf.Bytes())
		fmt.Fprintf(fgo2, "\n\n")
	}
	if *gccgo {

func isStructUnionClass(x ast.Expr) bool {
	id, ok := x.(*ast.Ident)
	if !ok {
		return false
	}
	name := id.Name
	return strings.HasPrefix(name, "_Ctype_struct_") ||
		strings.HasPrefix(name, "_Ctype_union_") ||
		strings.HasPrefix(name, "_Ctype_class_")
}

// FuncArg returns a Go type with the same memory layout as
// dtype when used as the type of a C function argument.

	//
	// The most common case is union types, which begin with
	// _Ctype_union and for which typedef[name] is a Go byte
	// array of the appropriate size (such as [4]byte).
	// Substitute those union types with byte arrays.
	for name, id := range goIdent {
		if id.Name == name && strings.Contains(name, "_Ctype_union") {
			if def := typedef[name]; def != nil {
				id.Name = gofmt(def)
			}
		}
	}