Merge pull request #5247 from CodaFi/mu

Author: swift-ci

lib/Sema/MiscDiagnostics.cpp

@@ -3739,7 +3739,7 @@ static void diagnoseUnintendedOptionalBehavior(TypeChecker &TC, const Expr *E,
             .fixItInsert(segmentStart, "String(describing: ")
             .fixItInsert(segment->getEndLoc(), ")");
 
-          // Suggest a cast to 'Optional'.
+          // Suggest inserting a default value. 
           TC.diagnose(segment->getLoc(), diag::default_optional_to_any)
             .highlight(segment->getSourceRange())
             .fixItInsert(segment->getEndLoc(), " ?? <#default value#>");