in mps-driver/src/main/java/org/jetbrains/mps/maven/driver/TemporarySolutionIO.java [69:77]
static void writeToFile(TemporarySolution temporarySolution, Path solutionFile) throws DescriptorIOException {
IFileSystem fs = getFS();
DescriptorIO<SolutionDescriptor> io =
new DescriptorIOFacade(macroHelpers()).standardProvider().solutionDescriptorIO();
io.writeToFile(
toSolutionDescriptor(temporarySolution),
fs.getFile(solutionFile.toAbsolutePath().toString())
);
}