in mps-driver/src/main/java/org/jetbrains/mps/maven/driver/TemporarySolutionIO.java [28:34]
private static ModelRootDescriptor newModelRootDescriptor(File modelsDirectory) {
IFileSystem fs = getFS();
return DefaultModelRoot.createDescriptor(
fs.getFile(modelsDirectory.getAbsolutePath()),
fs.getFile(modelsDirectory.getAbsolutePath())
);
}