Roman Leshchinskiy
John Goerzen gave one in the very first post of this thread: the fix to old-locale which didn't change any types but apparently changed the behaviour of a function quite drastically. Another example would be a change to the Ord instances for Float and Double which would have compare raise an exception on NaNs as discussed in a different thread on this list. Another one, which is admittedly silly but demonstrates my point, would be changing the implementation of map to
map _ _ = []
In general, any significant tightening/changing of preconditions and loosening/changing of postconditions would qualify.
OK, fair enough, I see how these can be considered changing the API. Thing is, whilst it would be possible in general to have a tool that determines if the API has changed based upon type signatures, etc. how would you go about automating the test for detecting if the "intention" of a function changes in this manner? -- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com