Selector aliasing: Renamings of message sends

[PragTob]

Case 1: Rename methods of traits (e.g. on conflicts):

explicit renamings (#select → #oldSelect), but trait code might use the original message names
idea: => Tool support, since it's hard to detect all calls in a dynamically typed language: present candidates to the programmer (exception: self select etc.)

Case 2: Incomplete classes

"traits" that require certain messages in the target

• example: trait T requires a method XY that does Z, class C provides AB that does Z: programmers explicitly specify that AB in C is XY and tool support that renames message sends in trait code
  More concrete example: Colelction methods like select require a working implementation of do which might in turn be named each cause a stupid ruby programmer wrote it.