Add Diagnostic source and severity

src/TolerantTreeAnalyzer.php

@@ -79,7 +79,10 @@ class TolerantTreeAnalyzer implements TreeAnalyzerInterface {
                     new Range(
                         new Position($range->start->line, $range->start->character),
                         new Position($range->end->line, $range->start->character)
-                    )
+                    ),
+                    null,
+                    DiagnosticSeverity::ERROR,
+                    'php'
                 );
             }
         }