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Verify static and default interface method bodies - #385
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Fix issue #343 by resolving return contracts from the nearest method and its declaring type, including interface static and default methods. Use exact parameter types and keep lambda returns separate from enclosing methods. Add passing and failing interface regressions.
rcosta358
approved these changes
Oct 9, 2026
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Fixes #343.
The verifier assumed every return and
thisaccess belonged to a class, so static and default interface methods crashed before verification. Return checking now uses the nearest method and its declaring type, resolves overloads by parameter types, and keeps lambda returns separate from an enclosing method. Interface method invocations also use their registered contracts.New passing cases cover the reported
String.length()call, annotated static/default methods,return this, same-arity overloads, and lambda returns inside interface bodies. New failing cases require errors for invalid static/default returns and a bad interface method argument.Validation:
mvn testpassed all 391 tests, and the four new fixtures produced their expected outcomes when run directly.This change does not extend interface supertype contract inheritance.