Works best with Rascal 0.42.0 (and rascal-maven-plugin 0.30.7). Due to changes in the type checker, users will most likely also have to update their library dependencies to the latest release. New Features for Rascal Developers Project target folders, containing binaries, are now excluded from search results by default to prevent duplicate results. The IDE provides a quick-fix to help configuring existing projects. New features for DSL developers DSLs can contribute their own code completion using the LanguageService::completion contribution. Improved features There is now a setting to influence how much memory is allocated for the Rascal and Parametric LSP servers (rascal.lSP.maxHeapSize). Automatic renaming of module names when moving files have been improved for escaped names. Automatic renaming of module names when moving files is now a lot faster in many cases. Various improvements for multi-project workspaces. Various performance & reliability improvements. Rascal 0.42.0 highlights Below is a summary of the full release-notes for rascal 0.42.x. Many improvements to the type-checker and the messages it produces. The interpreter is more robust when importing/extending complex module structures. The REPL betters supports (re)loading of modules. The debugger has gained many new features, improving the debugging experience.