[clang-format] Treat lambda in braced init as inline (#135520)

Fix #125430
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 82dc403..ef5f07e 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -5569,7 +5569,8 @@
 // Returns 'true' if 'Tok' is a function argument.
 static bool IsFunctionArgument(const FormatToken &Tok) {
   return Tok.MatchingParen && Tok.MatchingParen->Next &&
-         Tok.MatchingParen->Next->isOneOf(tok::comma, tok::r_paren);
+         Tok.MatchingParen->Next->isOneOf(tok::comma, tok::r_paren,
+                                          tok::r_brace);
 }
 
 static bool
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index f5c5a9e..b62d49e 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -23722,6 +23722,7 @@
   verifyFormat("function([]() { return b; })", MergeInline);
   verifyFormat("function([]() { return b; }, a)", MergeInline);
   verifyFormat("function(a, []() { return b; })", MergeInline);
+  verifyFormat("auto guard = foo{[&] { exit_status = true; }};", MergeInline);
 
   // Check option "BraceWrapping.BeforeLambdaBody" and different state of
   // AllowShortLambdasOnASingleLine