Throw custom exception when Scala 3 setup fails

build.sbt

@@ -220,6 +220,6 @@ lazy val V = new {
   val scalameta             = "4.8.8"
   val localSnapshotVersion  = "0.7.0-SNAPSHOT"
   // scala-steward:off
-  val zio                   = "1.0.18"
+  val zio = "1.0.18"
   // scala-steward:on
 }

interfaces/compiler/src/main/java/migrate/compiler/interfaces/Scala3Compiler.java

@@ -42,7 +42,7 @@ public Scala3Compiler(Compiler compiler, Context context) {
     this.context = context;
   }
 
-  public static Scala3Compiler setup(String[] args) {
+  public static Scala3Compiler setup(String[] args) throws Scala3SetupException {
     return Scala3Driver.setupCompiler(args);
   }
 

interfaces/compiler/src/main/java/migrate/compiler/interfaces/Scala3Driver.java

@@ -1,7 +1,19 @@
 package migrate.compiler.interfaces;
 
+
 import dotty.tools.dotc.Driver;
 import dotty.tools.dotc.core.Contexts.Context;
+import dotty.tools.dotc.reporting.ConsoleReporter;
+import dotty.tools.dotc.reporting.Diagnostic;
+import dotty.tools.dotc.reporting.StoreReporter;
+import dotty.tools.io.AbstractFile;
+
+import scala.Option;
+import scala.PartialFunction;
+import scala.Tuple2;
+import scala.collection.immutable.List;
+import scala.reflect.ClassTag;
+
 
 public class Scala3Driver extends Driver {
   private static Scala3Driver driver = new Scala3Driver();
@@ -14,12 +26,32 @@ public boolean sourcesRequired() {
     return false;
   }
 
-  public static Scala3Compiler setupCompiler(String[] args) {
+  public static Scala3Compiler setupCompiler(String[] args) throws Scala3SetupException {
     return driver.setup(args);
   }
 
-  public Scala3Compiler setup(String[] args) {
-    Context setup = driver.setup(args, initCtx()).get()._2;
-    return new Scala3Compiler(newCompiler(setup), setup);
+  public Scala3Compiler setup(String[] args) throws Scala3SetupException {
+    Context ctx1 = initCtx();
+    StoreReporter reporter = new StoreReporter(ctx1.reporter(), false);
+    Context ctx2 = ctx1.fresh().setReporter(reporter);
+    Option<Tuple2<List<AbstractFile>, Context>> setup = driver.setup(args, initCtx());
+    if (reporter.hasErrors()) {
+      PartialFunction<Diagnostic, String> errorMessages = new PartialFunction<Diagnostic, String>() {
+        public boolean isDefinedAt(Diagnostic diag) {
+          return diag.level() == Diagnostic.ERROR;
+        }
+        public String apply(Diagnostic diag) {
+          if (isDefinedAt(diag))
+            return diag.message();
+          else
+            throw new scala.MatchError(diag);
+        }
+      };
+      String message = reporter.removeBufferedMessages(ctx2).collect(errorMessages).head();
+      throw new Scala3SetupException(message);
+    } else {
+      Context ctx3 = setup.get()._2;
+      return new Scala3Compiler(newCompiler(ctx3), ctx3);
+    }
   }
 }

interfaces/compiler/src/main/java/migrate/compiler/interfaces/Scala3SetupException.java

@@ -0,0 +1,7 @@
+package migrate.compiler.interfaces;
+
+public final class Scala3SetupException extends Exception {
+  public Scala3SetupException(String message) {
+    super(message);
+  }
+}

migrate/src/main/scala/migrate/Scala3Migrate.scala

@@ -85,9 +85,7 @@ class Scala3Migrate(scalafixSrv: ScalafixService, baseDirectory: AbsolutePath, l
     // It's easier no to deal with semanticdb option, since we don't need semanticdb files
     val modified           = scala3CompilerOptions.filterNot(elm => elm == "-Xsemanticdb" || elm == "-Ysemanticdb")
     val scala3CompilerArgs = modified.toArray ++ Array("-classpath", classpath.value, "-d", classDirectory.value)
-    Try {
-      Scala3Compiler.setup(scala3CompilerArgs)
-    }
+    Try(Scala3Compiler.setup(scala3CompilerArgs))
   }
 
   private def compileWithRewrite(