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a292817d57
## Summary
It turns out that when we iterate over the incompatibilities of a
package, PubGrub will _also_ show us the inverse dependencies. I suspect
this was rare, because we have a version check at the bottom... So, this
specifically required that you had some dependency that didn't end up
appearing in the output resolution, but that matched the version
constraints of the package you care about.
In this case, `langchain-community` depends on `langchain-core`. So we
were seeing an incompatibility like:
```rust
FromDependencyOf(Package(PackageName("langchain-community"), None, None), Range { segments: [(Included("0.0.10"), Included("0.0.10")), (Included("0.0.11"), Included("0.0.11"))] }, Package(PackageName("langchain-core"), None, None), Range { segments: [(Included("0.1.8"), Excluded("0.2"))] })
```
Where we were iterating over `langchain-core`, and looking for version
`0.0.11`... which happens to match `langchain-community`.
(`langchain-community was omitted from the resolution; hence, it didn't
exist in the map.)
Closes https://github.com/astral-sh/uv/issues/2358.
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