(e.g., `nullable.a = b`), and use positioning strategies to locate the
dot in the LHS expression.
Without it, only the callee reference is reported on, which makes the
highlighting of the error and application of quickfixes incorrect in the
IDE.
Also fixed issue with annotated and/or labeled expressions on LHS of
assignment (e.g., `(@Ann label@ i) = 34`).
`iterator()` function that does NOT have `operator` modifier.
This is different from FE1.0. Adding `!!` will then surface the error
that `operator` modifier needs to be added (with corresponding fix).
UNSAFE_OPERATOR_CALL, UNSAFE_INFIX_CALL, ITERATOR_ON_NULLABLE,
ARGUMENT_TYPE_MISMATCH, RETURN_TYPE_MISMATCH.
TODO: Don't offer fix when target is known to be null (from data flow
analysis).
Mark Punzalan