Bug with -w and newline in pattern

[epa]

If the search pattern ends with a newline then -w misbehaves:

% mkdir n; cd n
% echo abcde >foo
% ack -w bcd
% ack -w 'bcd|
'
foo
1:abcde

Here the last command typed contains a newline between '' characters.

(While I agree that a newline in a pattern is an unusual case, it is not impossible, and a correct program is one that works on all inputs, not just the more likely ones. If newline in patterns is not supported then it would be better to give a warning.)

[epa]

Apologies, I need to do some more thinking on this.