Casted variable declarations for 'if (v is! Type)' should be declared after IfStatement.

pkg/analysis_server/lib/src/services/correction/assist_internal.dart

Index: pkg/analysis_server/lib/src/services/correction/assist_internal.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/assist_internal.dart b/pkg/analysis_server/lib/src/services/correction/assist_internal.dart
index 3bed9ab989b22baad6804a8d3253d43cdd1c7209..63287c4eb0fd4e96a9aa3b93a488db21167e9ab1 100644
--- a/pkg/analysis_server/lib/src/services/correction/assist_internal.dart
+++ b/pkg/analysis_server/lib/src/services/correction/assist_internal.dart
@@ -802,10 +802,19 @@ class AssistProcessor {
       _coverageMarker();
       return;
     }
+    // prepare location
+    int offset;
+    String statementPrefix;
+    if (isExpression.notOperator == null) {
+      offset = targetBlock.leftBracket.end;
+      statementPrefix = indent;
+    } else {
+      offset = targetBlock.rightBracket.end;
+      statementPrefix = '';
+    }
     // prepare source
-    int offset = targetBlock.leftBracket.end;
     SourceBuilder builder = new SourceBuilder(file, offset);
-    builder.append(eol + prefix + indent);
+    builder.append(eol + prefix + statementPrefix);
     builder.append(castTypeCode);
     // prepare excluded names
     Set<String> excluded = new Set<String>();