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## Summary `KnownInstance::instance_fallback` may return instances of supertypes. For example, it returns an instance of `_SpecialForm` for `Literal`. This means it can't be used on the right-hand side of `is_subtype_of` relationships, because it might lead to false positives. I can lead to false negatives on the left hand side of `is_subtype_of`, but this is at least a known limitation. False negatives are fine for most applications, but false positives can lead to wrong results in intersection-simplification, for example. closes #14731 ## Test Plan Added regression test |
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| .. | ||
| module_resolver | ||
| semantic_index | ||
| types | ||
| util | ||
| ast_node_ref.rs | ||
| db.rs | ||
| lib.rs | ||
| module_name.rs | ||
| node_key.rs | ||
| program.rs | ||
| python_version.rs | ||
| semantic_index.rs | ||
| semantic_model.rs | ||
| site_packages.rs | ||
| stdlib.rs | ||
| symbol.rs | ||
| types.rs | ||
| unpack.rs | ||