Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -2583,7 +2583,7 @@
           (Start->Previous &&
            Start->Previous->isOneOf(TT_RequiresClause,
                                     TT_RequiresClauseInARequiresExpression))
-              ? [this](){
+              ? [this]() {
                   auto Ret = Current ? Current : Line.Last;
                   while (!Ret->ClosesRequiresClause && Ret->Previous)
                     Ret = Ret->Previous;