Skip errors that cannot be resynthesized.

pkg/analyzer/lib/src/dart/analysis/driver.dart

Index: pkg/analyzer/lib/src/dart/analysis/driver.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/driver.dart b/pkg/analyzer/lib/src/dart/analysis/driver.dart
index 7b985333ef123675b6b455e343776b479c6596ab..9c3117a88493ab19387d709e77740ac5a9460a84 100644
--- a/pkg/analyzer/lib/src/dart/analysis/driver.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/driver.dart
@@ -1215,28 +1215,28 @@ class AnalysisDriver implements AnalysisDriverGeneric {
   }
 
   /**
-   * Return [AnalysisError]s for the given [serialized] errors.
+   * Return [AnalysisError]s for the given [serializedErrors].
    */
   List<AnalysisError> _getErrorsFromSerialized(
-      FileState file, List<AnalysisDriverUnitError> serialized) {
-    return serialized.map((error) {
-      String errorName = error.uniqueName;
+      FileState file, List<AnalysisDriverUnitError> serializedErrors) {
+    List<AnalysisError> errors = <AnalysisError>[];
+    for (AnalysisDriverUnitError serializedError in serializedErrors) {
+      String errorName = serializedError.uniqueName;
       ErrorCode errorCode =
           errorCodeByUniqueName(errorName) ?? _lintCodeByUniqueName(errorName);
-      if (errorCode == null) {
-        // This could fail because the error code is no longer defined, or, in
-        // the case of a lint rule, if the lint rule has been disabled since the
-        // errors were written.
-        throw new StateError('No ErrorCode for $errorName in $file');
+      if (errorCode != null) {
+        errors.add(new AnalysisError.forValues(
+            file.source,
+            serializedError.offset,
+            serializedError.length,
+            errorCode,
+            serializedError.message,
+            serializedError.correction.isEmpty
+                ? null
+                : serializedError.correction));
       }
-      return new AnalysisError.forValues(
-          file.source,
-          error.offset,
-          error.length,
-          errorCode,
-          error.message,
-          error.correction.isEmpty ? null : error.correction);
-    }).toList();
+    }
+    return errors;
   }
 
   /**