Additional errors appearing when running on one file

A very specific circular import can cause the reported error to be reported differently, and the error deduplicator is affected:

1. run on specific file `mypy test.py`:
- expression contains Any "Untyped"
- expression contains Any "Any (unannotated)"
2. run on whole project `mypy .`:
- expression contains Any "Untyped"
- expression contains Any "Untyped" (removed by deduplicator)

this is especially an issue in IDEs that run mypy against a single file

TODO: insert egg

Reproduce the report with `mypy test.py` and `mypy .`, focusing on the circular-import case and the error deduplicator mentioned in the issue. Trace the diagnostics produced by each entry point; done means single-file and whole-project runs report the intended errors consistently without an incorrect duplicate or changed wording.

Written by the indexing model from the issue text.