revset: add test for resolution of infix/suffix ambiguity of x^:y
This is the test for 805651777188, and I'm going to fix the failure of
'x^A' where 'revsetalias.A=:y'.
parser: remove unused binding parameter from suffix action
Because a suffix action never takes subsequent tokens, it should have
no binding strength nor closing character. I've tried if this value could
be used to resolve infix/suffix ambiguity of x^:y, but it appears not. So
I decided to resend this patch.