fileset: treat encoding and eol as the predicate calling _existing
Before this patch, predicate function 'encoding' and 'eol' aren't
listed up in '_existingcallers', even though they invoke 'existing()'.
This causes unexpected failure of these predicate, if there is a
(manually) deleted file in the working directory.
8a0513bf030a and
3ce3f2b059a1 seem to overlook putting already
existing 'encoding' or newly introduced 'eol' into '_existingcallers'.
This patch also changes order of fileset "eol(unix)" output in test,
because "existing caller" predicates show "A(dded)" files before
"C(lean)" ones.
rebase: simplify documentation about --keep
Also include a warning about bookmarks
verify: clean up weird error/warning lists
Nested functions in Python are not able to assign to variables in the
outer scope without something like the list trick because assignments
refer to the inner scope. So, we formerly used a list to give an
object to assign into.
Now that error and warning are object members, the [0] hack is no
longer needed.
verify: remove unreachable code to reraise KeyboardInterrupt
KeyboardInterrupt should never be caught as it doesn't inherit Exception in
Python 2.5 or later. And if it was, "interrupted" would be printed twice.
https://docs.python.org/2.7/library/exceptions.html#exception-hierarchy
verify: move exc() function onto class
This is part of an effort to make verify more modular so extensions can hook
into it.