Member predicate ExprStmt :: isDoubleColonMethod

Holds if this expression statement is a JScript-style double colon method declaration.

                            
                                
                                    predicate
                                
                                 
                            
                            
                                isDoubleColonMethod
                            
                            
                                (
                                
                                    
                                        Identifier
                                    
                                     
                                    interface
                                
                                , 
                                
                                    
                                        Identifier
                                    
                                     
                                    id
                                
                                , 
                                
                                    
                                        Function
                                    
                                     
                                    f
                                
                                )