Type inference: scan the enclosing type for inference variables

[mernst]

AnnotatedContainsInferenceVariable.visitDeclared visited only the type arguments, so a type such as Outer<T>.Inner, which mentions T only in its enclosing type, was classified as a proper type. ContainsInferenceVariable, the unannotated twin, already visits the enclosing type.

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Reviewing files that changed from the base of the PR and between 03365e0 and ae64501.

📒 Files selected for processing (3)

• checker/tests/nullness/java8inference/EnclosingType.java
• framework/src/main/java/org/checkerframework/framework/util/typeinference8/constraint/Typing.java
• framework/src/main/java/org/checkerframework/framework/util/typeinference8/types/AbstractType.java

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📝 Walkthrough

Walkthrough

The change adds AbstractType.getEnclosingType() and documents enclosing-type arguments. Type inference now traverses enclosing types and adds subtype or equality constraints for parameterized inner classes. EnclosingType.java adds nullness inference tests for direct, collection, array, functional-interface, nested-generic, and recursively bounded cases.

Suggested reviewers: smillst

Merge Risk: 🟡 Moderate · up to ae645

The updated type-inference behavior produces a nullness diagnostic that the regression test does not yet declare, so the test must be corrected before this change is merge-ready.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 31.03% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 29 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@checker/tests/nullness/java8inference/EnclosingType.java`:
- Line 29: Add expected-diagnostic directives for both make(ns) calls in
EnclosingType, at the assignments to Outer<`@NonNull` String>.Inner on lines 29
and 34. Ensure the directives capture the incompatible constraints between
`@Nullable` String and the target’s `@NonNull` String.

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Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between c1efe65 and 03365e0.

📒 Files selected for processing (2)

• checker/tests/nullness/java8inference/EnclosingType.java
• framework/src/main/java/org/checkerframework/framework/util/typeinference8/types/AnnotatedContainsInferenceVariable.java