[Swift-devel] AbstractFileMapper changes

[Ben Clifford]

r1242 makes a number of subtle changes to the behaviour of the 
AbstractFileMapper and its subclasses (which is many of the mappers - for 
example simple_mapper)

As far as I can tell, situations that previously worked will mostly still 
work, and some cases which did not work will now work (which was the point 
of the exercise).

There are some changes in the behaviour of prefixes because the behaviour 
was previously inconsistent: if you want a separator between the prefix 
and the first mapped field, you will now need to include that separator as 
part of the prefix. (previously, this was the case in some situations and 
not in others)

I have no test cases for the two application specific mappers, the ROI 
mapper and the airsn mapper. If anyone still cares about them, please test 
them (and ideally submit tests to the tests/language-behaviour/ test 
suite)

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