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Diagnostics for unresolved references

crates/ty_python_semantic/resources/mdtest/diagnostics/unresolved_reference.md

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Diagnostics for unresolved references

New builtin used on old Python version

<!-- snapshot-diagnostics -->
toml
[environment]
python-version = "3.9"
py
aiter  # error: [unresolved-reference]

Typing builtin has Info help

A special diagnostic is emitted when using a deprecated alias from Typing that is builtin in this version of Python. (full diagnostic captured in snapshot)

Info present in Python 3.9+

<!-- snapshot-diagnostics -->
toml
[environment]
python-version = "3.9"
py
foo: List[int]  # error: [unresolved-reference]
bar: Type  # error: [unresolved-reference]

Info not present before Python 3.9

<!-- snapshot-diagnostics -->
toml
[environment]
python-version = "3.8"
py
foo: List[int]  # error: [unresolved-reference]
bar: Type  # error: [unresolved-reference]