Fix Scala 2.12 cross-compilation

Author: adpi2

.github/workflows/ci.yml

@@ -11,6 +11,15 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - run: ./bin/scalafmt --test
+  cross-compilation:
+    name: Cross Compilation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: coursier/[email protected]
+        with:
+          app: sbt
+      - run: sbt +compile
   test:
     strategy:
       fail-fast: false

expression-compiler/src/main/scala-2/scala/tools/nsc/ExpressionCompilerBridge.scala

@@ -6,6 +6,7 @@ import java.{util => ju}
 import scala.jdk.CollectionConverters._
 import scala.tools.nsc.reporters.StoreReporter
 import scala.util.control.NonFatal
+import scala.annotation
 
 final class ExpressionCompilerBridge {
   def run(
@@ -31,7 +32,7 @@ final class ExpressionCompilerBridge {
     ) ++ options :+ sourceFile.toString
 
     val command = new CompilerCommand(args, errorConsumer.accept(_))
-    val reporter = new StoreReporter(command.settings)
+    val reporter = new StoreReporter(): @annotation.nowarn()
     val global = new ExpressionGlobal(
       command.settings,
       reporter,