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[ty] Enums: allow multiple aliases to point to the same member (#20669)

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## Summary

closes https://github.com/astral-sh/ty/issues/1293

## Test Plan

Regression test
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David Peter 2025-10-01 15:51:53 +02:00 • committed by GitHub
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35
crates/ty_python_semantic/resources/mdtest/enums.md
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@ -265,6 +265,41 @@ reveal_type(enum_members(Color))
reveal_type(Color.red)
```
Multiple aliases to the same member are also supported. This is a regression test for
<https://github.com/astral-sh/ty/issues/1293>:
```py
from ty_extensions import enum_members
class ManyAliases(Enum):
real_member = "real_member"
alias1 = "real_member"
alias2 = "real_member"
alias3 = "real_member"
other_member = "other_real_member"
# revealed: tuple[Literal["real_member"], Literal["other_member"]]
reveal_type(enum_members(ManyAliases))
reveal_type(ManyAliases.real_member) # revealed: Literal[ManyAliases.real_member]
reveal_type(ManyAliases.alias1) # revealed: Literal[ManyAliases.real_member]
reveal_type(ManyAliases.alias2) # revealed: Literal[ManyAliases.real_member]
reveal_type(ManyAliases.alias3) # revealed: Literal[ManyAliases.real_member]
reveal_type(ManyAliases.real_member.value) # revealed: Literal["real_member"]
reveal_type(ManyAliases.real_member.name) # revealed: Literal["real_member"]
reveal_type(ManyAliases.alias1.value) # revealed: Literal["real_member"]
reveal_type(ManyAliases.alias1.name) # revealed: Literal["real_member"]
reveal_type(ManyAliases.alias2.value) # revealed: Literal["real_member"]
reveal_type(ManyAliases.alias2.name) # revealed: Literal["real_member"]
reveal_type(ManyAliases.alias3.value) # revealed: Literal["real_member"]
reveal_type(ManyAliases.alias3.name) # revealed: Literal["real_member"]
```
### Using `auto()`
```toml