What is a type error?

[Darren New]

Eliot Miranda wrote:
> can only actually carry-out operations on objects that implement them. 

Execpt that every operation is implemented by every object in Smalltalk. 
Unless you specify otherwise, the implementation of every method is to 
call the receiver with doesNotUnderstand.  (I don't recall whether the 
class of nil has a special rule for this or whether it implements 
doesNotUnderstand and invokes the appropriate "don't send messages to 
nil" method.)

There are a number of Smalltalk extensions, such as 
multiple-inheritance, that rely on implementing doesNotUnderstand.

-- 
   Darren New / San Diego, CA, USA (PST)
     Native Americans used every part
     of the buffalo, including the wings.