Address warnings.

buildSrc/src/main/java/lfformat/LfFormatStep.java

@@ -67,7 +67,7 @@ private Step() throws IOException {
     @Override
     public String format(
         @SuppressWarnings("NullableProblems") String rawUnix,
-        @SuppressWarnings("NullableProblems") File file)
+        File file)
         throws IOException, InterruptedException {
       StringBuilder output = new StringBuilder();
       try {
@@ -119,15 +119,6 @@ private void initializeFormatter() throws IOException {
       error = new BufferedReader(new InputStreamReader(formatter.getErrorStream()));
     }
 
-    //    /** Run the formatter on the given file and return the resulting process handle. */
-    //    private Process runFormatter(File file) throws IOException {
-    //      // It looks silly to invoke Java from Java, but it is necessary in
-    //      // order to break the circularity of needing the program to be built
-    //      // in order for it to be built.
-    //      var formatter = getFormatter();
-    //      return formatter;
-    //    }
-
     @SuppressWarnings("NullableProblems")
     @Override
     public String getName() {

org.lflang/src/org/lflang/cli/CliBase.java

@@ -24,7 +24,6 @@
 import org.eclipse.emf.ecore.resource.Resource;
 import org.eclipse.emf.ecore.resource.ResourceSet;
 import org.eclipse.xtext.util.CancelIndicator;
-import org.eclipse.xtext.util.RuntimeIOException;
 import org.eclipse.xtext.validation.CheckMode;
 import org.eclipse.xtext.validation.IResourceValidator;
 import org.eclipse.xtext.validation.Issue;
@@ -180,7 +179,7 @@ protected List<Path> getInputPaths() {
       try {
         line = reader.readLine();
       } catch (IOException e) {
-        throw new RuntimeIOException(e);
+        throw new RuntimeException(e);
       }
       if (line == null) return List.of();
       return List.of(Path.of(line));