[0.980 backport] Allow unpacking from TypeVars with iterable bounds (#13425) #13644
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* Allow unpacking from TypeVars by resolving bounds TypeVars aren't iterable, but their bounds might be! Resolve a TypeVar to its bounds before trying to decide how to unpack one of its instances. Fixes python#13402.
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Diff from mypy_primer, showing the effect of this PR on open source code: sublime_debugger (https://github.com/daveleroy/sublime_debugger)
- modules/core/event.py:27: error: "Unpack" is not supported by mypy yet
- modules/core/event.py:37: error: "Unpack" is not supported by mypy yet
+ modules/core/event.py:27: error: "Unpack" is not supported yet, use --enable-incomplete-features
+ modules/core/event.py:37: error: "Unpack" is not supported yet, use --enable-incomplete-features
- modules/core/event.py:59: error: "Unpack" is not supported by mypy yet
- modules/core/event.py:69: error: "Unpack" is not supported by mypy yet
- modules/core/event.py:75: error: "Unpack" is not supported by mypy yet
+ modules/core/event.py:59: error: "Unpack" is not supported yet, use --enable-incomplete-features
+ modules/core/event.py:69: error: "Unpack" is not supported yet, use --enable-incomplete-features
+ modules/core/event.py:75: error: "Unpack" is not supported yet, use --enable-incomplete-features
- modules/core/core.py:30: error: "Unpack" is not supported by mypy yet
- modules/core/core.py:33: error: "Unpack" is not supported by mypy yet
- modules/core/core.py:36: error: "Unpack" is not supported by mypy yet
- modules/core/core.py:42: error: "Unpack" is not supported by mypy yet
+ modules/core/core.py:30: error: "Unpack" is not supported yet, use --enable-incomplete-features
+ modules/core/core.py:33: error: "Unpack" is not supported yet, use --enable-incomplete-features
+ modules/core/core.py:36: error: "Unpack" is not supported yet, use --enable-incomplete-features
+ modules/core/core.py:42: error: "Unpack" is not supported yet, use --enable-incomplete-features
- modules/core/core.py:51: error: "Unpack" is not supported by mypy yet
+ modules/core/core.py:51: error: "Unpack" is not supported yet, use --enable-incomplete-features
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TypeVars aren't iterable, but their bounds might be! Resolve a TypeVar to its bounds before trying to decide how to unpack one of its instances.
Fixes #13402