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The use of `Language.findInstance()` implicitly depended on the fact that `SimpleLanguage.INSTANCE` was referenced at some earlier point in time. In this case, that happens because the instantiation of `SimpleParserDefinition` triggers the instantiation of `COMMENTS`, which relies on `SimpleTypes.COMMENT`. When basing one's work on this sample project, however, one may run into issues. Specifically, the absence of a custom comment token type will mean a failure to correctly instantiate the singleton language object. Making the dependence on `SimpleLanguage.INSTANCE` explicit prevents that issue from occurring.