Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -3337,9 +3337,11 @@
   }
 
   // trailing return type 'auto': []() -> auto {}, auto foo() -> auto {}
-  if (Left.is(tok::kw_auto) &&
-      Right.isOneOf(TT_LambdaLBrace, TT_FunctionLBrace))
+  if (Left.is(tok::kw_auto) && Right.isOneOf(TT_LambdaLBrace, TT_FunctionLBrace,
+                                             // function return type 'auto'
+                                             TT_FunctionTypeLParen)) {
     return true;
+  }
 
   // auto{x} auto(x)
   if (Left.is(tok::kw_auto) && Right.isOneOf(tok::l_paren, tok::l_brace))
Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -24887,7 +24887,7 @@
                                 // the user's own fault
   verifyFormat("integral auto(x) = y;"); // actually a declaration, but this is
                                          // clearly the user's own fault
-  verifyFormat("auto(*p)() = f;");       // actually a declaration; TODO FIXME
+  verifyFormat("auto (*p)() = f;");
 }
 
 TEST_F(FormatTest, Cpp20ModulesSupport) {