Do not import List, Dict, and Set by default #2863
Merged
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Fix #999
This is a straightforward fix:
List
,Set
, andDict
are treated as aliases to theirbuiltins
counterparts, therefore they are ignored byremove_imported_names_from_symtable
, I fix this by also removing the alias names.This depends on python/typeshed#933 + sync typeshed
The fix also revealed few places in mypy where imports were missing.