Treat types inferred from context as upper bounds on a method's return type instead of directly installing them as return types directly - #528
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📝 WalkthroughWalkthroughThe change adds configurable surrounding-context type inference. Synthetic method generation now records bounds for generated placeholder return types, preserves constrained placeholders, and collapses memberless placeholders after slice construction. Slicer removes collapsed symbols before generating supertype alternates. New regression tests and fixtures cover context and member-access ordering, 🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
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Inline comments:
In
`@src/main/java/org/checkerframework/specimin/unsolved/UnsolvedSymbolGenerator.java`:
- Around line 3496-3505: Update the bound-recording logic around
getOrCreateMemberTypeFromFQNs so dotless placeholders converted to
SolvedMemberType are also recorded in placeholderReturnTypeBounds. Remove the
requirement that placeholder be an UnsolvedMemberType, while preserving the
existing mapping from the placeholder type to bound for all placeholder kinds so
collapseMemberlessPlaceholderReturnTypes retains the context constraint.
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📒 Files selected for processing (33)
src/main/java/org/checkerframework/specimin/Slicer.javasrc/main/java/org/checkerframework/specimin/unsolved/FullyQualifiedNameGenerator.javasrc/main/java/org/checkerframework/specimin/unsolved/UnsolvedClassOrInterfaceAlternates.javasrc/main/java/org/checkerframework/specimin/unsolved/UnsolvedSymbolGenerator.javasrc/test/java/org/checkerframework/specimin/ContextTypeThenMemberAccessTest.javasrc/test/java/org/checkerframework/specimin/MemberAccessThenContextTypeTest.javasrc/test/java/org/checkerframework/specimin/NonExtendableTargetTypeVariableTest.javasrc/test/java/org/checkerframework/specimin/ObjectContextThenMemberAccessTest.javasrc/test/java/org/checkerframework/specimin/PlaceholderAndCallerTypeVariableTest.javasrc/test/resources/contexttypethenmemberaccess/expected/com/example/Payload.javasrc/test/resources/contexttypethenmemberaccess/expected/com/example/Simple.javasrc/test/resources/contexttypethenmemberaccess/expected/org/example/FooReturnType.javasrc/test/resources/contexttypethenmemberaccess/expected/org/example/GetPayloadReturnType.javasrc/test/resources/contexttypethenmemberaccess/expected/org/example/Item.javasrc/test/resources/contexttypethenmemberaccess/input/com/example/Payload.javasrc/test/resources/contexttypethenmemberaccess/input/com/example/Simple.javasrc/test/resources/memberaccessthencontexttype/expected/com/example/Payload.javasrc/test/resources/memberaccessthencontexttype/expected/com/example/Simple.javasrc/test/resources/memberaccessthencontexttype/expected/org/example/FooReturnType.javasrc/test/resources/memberaccessthencontexttype/expected/org/example/GetPayloadReturnType.javasrc/test/resources/memberaccessthencontexttype/expected/org/example/Item.javasrc/test/resources/memberaccessthencontexttype/input/com/example/Payload.javasrc/test/resources/memberaccessthencontexttype/input/com/example/Simple.javasrc/test/resources/objectcontextthenmemberaccess/expected/com/example/Simple.javasrc/test/resources/objectcontextthenmemberaccess/expected/org/example/FooReturnType.javasrc/test/resources/objectcontextthenmemberaccess/expected/org/example/GetPayloadReturnType.javasrc/test/resources/objectcontextthenmemberaccess/expected/org/example/Item.javasrc/test/resources/objectcontextthenmemberaccess/input/com/example/Simple.javasrc/test/resources/placeholderandcallertypevariable/expected/com/example/Payload.javasrc/test/resources/placeholderandcallertypevariable/expected/com/example/Simple.javasrc/test/resources/placeholderandcallertypevariable/expected/org/example/Item.javasrc/test/resources/placeholderandcallertypevariable/input/com/example/Payload.javasrc/test/resources/placeholderandcallertypevariable/input/com/example/Simple.java
💤 Files with no reviewable changes (1)
- src/test/java/org/checkerframework/specimin/NonExtendableTargetTypeVariableTest.java
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This fixes an order-dependency bug (that I discovered while working on #509): before this change, the source order determined which type from context was actually installed as the return type, which meant that when there were multiple use sites some orders compiled and some did not. This change correctly treats context as a bound rather than a fact.