Bad USE statement crashes parser

[klausler]

module m
   interface
     function foo()
     end function
   end interface
end module
function foo()
  use :: m, except => function foo
end function

Note the erroneous use of the keyword function in the renaming clause.

Produces fatal internal error: CHECK(state.anyDeferredMessages() || state.messages().AnyFatalError()) failed at /home/pklausler/f18proto/git/f18b/lib/parser/basic-parsers.h(381).