private final StringInterner interner;

    public PreviousCompilationAccess(StringInterner interner) {
        this.interner = interner;
    }

    public PreviousCompilationData readPreviousCompilationData(File source) {
        try (KryoBackedDecoder encoder = new KryoBackedDecoder(new FileInputStream(source))) {
            return new PreviousCompilationData.Serializer(interner).read(encoder);

        CurrentCompilation currentCompilation = new CurrentCompilation(spec, classpathSnapshotter);

        PreviousCompilationData previousCompilationData = previousCompilationAccess.readPreviousCompilationData(previousCompilationDataFile);
        PreviousCompilation previousCompilation = new PreviousCompilation(previousCompilationData);

        run language.compileTaskName

        then:
        outputs.recompiledClasses("A", 'A$C')
        def previousCompilationData = previousCompilationAccess.readPreviousCompilationData(previousCompilationDataFile)
        previousCompilationData.compilerApiData.sourceToClassMapping == [
            ("test/gradle/A.${languageName}" as String): ["test.gradle.A", "test.gradle.A\$C"] as Set,