Dummy refacto / fix

cache/src/main/scala/coursier/FileError.scala

@@ -7,6 +7,11 @@ sealed abstract class FileError(
   val message: String
 ) extends Product with Serializable {
   def describe: String = s"${`type`}: $message"
+
+  final def notFound: Boolean = this match {
+    case _: FileError.NotFound => true
+    case _ => false
+  }
 }
 
 object FileError {

sbt-coursier/src/main/scala/coursier/Tasks.scala

@@ -352,7 +352,8 @@ object Tasks {
     project: Project,
     resolution: Map[Set[String], Resolution],
     withClassifiers: Boolean,
-    sbtClassifiers: Boolean
+    sbtClassifiers: Boolean,
+    ignoreArtifactErrors: Boolean
   )
 
   private val resolutionsCache = new mutable.HashMap[ResolutionCacheKey, Map[Set[String], Resolution]]
@@ -1142,20 +1143,12 @@ object Tasks {
             artifact -> file
         }
 
-        val (ignoredArtifactErrors, artifactErrors) = artifactFilesOrErrors0
+        val artifactErrors = artifactFilesOrErrors0
           .toVector
           .collect {
-            case (a, -\/(err)) =>
+            case (a, -\/(err)) if !a.isOptional || !err.notFound =>
               a -> err
           }
-          .partition {
-            case (a, err) =>
-              val notFound = err match {
-                case _: FileError.NotFound => true
-                case _ => false
-              }
-              a.isOptional && notFound
-          }
 
         if (artifactErrors.nonEmpty) {
           val error = ResolutionError.DownloadErrors(artifactErrors.map(_._2))
@@ -1194,7 +1187,8 @@ object Tasks {
           currentProject,
           res,
           withClassifiers,
-          sbtClassifiers
+          sbtClassifiers,
+          ignoreArtifactErrors
         ),
         report
       )