Vladislav Zavialov authored Feb 19, 2019 and Marge Bot committed Feb 21, 2019

The dot type operator was handled in the 'tyvarop' parser production, and the
bang type operator in 'tyapp'. However, export lists and role annotations use
'oqtycon', so these type operators could not be exported or assigned roles.

The fix is to handle them in a lower level production, 'tyconsym'.