Another correction; I said that this is occurring for return type annotations; this is not true. This is only occurring for functions with annotated *arguments*.

The cause of this issue is in pygettext's TokenEater.__suiteseen method. This method eats tokens until it sees a colon operator, after which it assumes a function docstring may follow. In the case of a function with annotated arguments, obviously this is incorrect, as colons would appear before the final colon of the 'suite'.