parser: take suffix action if no infix action is defined

If no infix action is defined, a suffix action isn't ambiguous, so it should
be taken no matter if the next token can be an operand. This is exactly the
same flow as prefix/primary handling.

This change has no effect now because all suffix tokens have infix actions.

mercurial/parser.py

@@ -62,7 +62,7 b' class parser(object):'
             token, value, pos = self._advance()
             # handle infix rules, take as suffix if unambiguous
             infix, suffix = self._elements[token][3:]
-            if suffix and not self._hasnewterm():
+            if suffix and not (infix and self._hasnewterm()):
                 expr = (suffix[0], expr)
             elif infix:
                 expr = (infix[0], expr, self._parseoperand(*infix[1:]))