False error: @StateSet on a nested class gives "Argument Mismatch Error: ... expected Inner, got Inner"

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缺陷
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描述清楚
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技术栈
java
领域
compilers

调研方向

Start with TypeChecker.createStateGhost, then follow how GhostFunction and Utils handle the nested-class name Outer$Inner; Expression.throwArgumentMismatchError explains the reported type mismatch. Reproduce using the issue's Java example and compare with the top-level Inner case; done when the nested-class example verifies with “Correct! Passed Verification.”

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描述

bug error messages

Impact: typestates on a nested class cannot be used: every state refinement of it fails with a self-contradictory message (expected Inner, got Inner) and no source location. The same class at top level verifies.

Minimal reproducer

import liquidjava.specification.StateRefinement;
import liquidjava.specification.StateSet;

public class Outer {
    @StateSet({"fresh", "ready"})
    static class Inner {
        @StateRefinement(to = "ready(this)")
        public Inner() {}

        @StateRefinement(from = "ready(this)", to = "fresh(this)")
        public void use() {}
    }

    static void ok() {
        Inner i = new Inner();
        i.use();
    }
}

Expected: Correct! Passed Verification., as for the same Inner as a top-level class.

Actual (main @ 0053074e; this is the whole output, with no code snippet):

Argument Mismatch Error: Argument '#this_1' and its respective parameter of ghost 'Outer$Inner.state1' types are incompatible: expected Inner, got Inner

Cause. TypeChecker.createStateGhost gives the stateN ghost the parameter type type.getSimpleName() (Inner). GhostFunction swaps that for the prefix only when it equals Utils.getSimpleName(prefix), which splits on . only, so for Outer$Inner it is Outer$Inner and the swap does not happen. The parameter type stays an unresolved reference to Inner, which is neither equal to nor a supertype of Outer$Inner in Expression.throwArgumentMismatchError; both print as Inner. Related: the $ vs . naming of nested classes also breaks @Ghost on them (Z3 sort mismatch, #467).

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