Report on resolution failures from the scanning phase

Author: sambsnyd

rewrite-maven/src/main/java/org/openrewrite/maven/ChangeParentPom.java

@@ -173,6 +173,7 @@ public Validated<Object> validate() {
 
     public static class Accumulator {
         @Nullable MavenResolutionResult updatedRootMarker;
+        @Nullable MavenDownloadingException scannerException;
         final Map<ResolvedGroupArtifactVersion, MavenResolutionResult> gavToOriginalMarker = new HashMap<>();
         final Map<ResolvedGroupArtifactVersion, MavenResolutionResult> gavToNewMarker = new HashMap<>();
 
@@ -308,7 +309,7 @@ public Xml.Document visitDocument(Xml.Document document, ExecutionContext ctx) {
                             acc.updatedRootMarker = mrr.withPom(updatedResolvedPom);
                         }
                     } catch (MavenDownloadingException e) {
-                        // Version resolution failed, will be handled in visitor phase
+                        acc.scannerException = e;
                     }
                 }
                 return document;
@@ -465,6 +466,9 @@ public Xml.Tag visitTag(Xml.Tag tag, ExecutionContext ctx) {
                             }
                             return e.warn(tag);
                         }
+                        if (acc.scannerException != null) {
+                            t = acc.scannerException.warn(t);
+                        }
                     }
                 }
                 return t;