[clang] [clang] Correct end for the `CastOperation.OpRange` (PR #69480)

[Botond István Horváth via cfe-commits]

https://github.com/HoBoIs updated https://github.com/llvm/llvm-project/pull/69480

>From f75c2e75042d6d8f5a093967a56f3f59d7e541f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Botond=20Istv=C3=A1n=20Horv=C3=A1th?=
 <56926027+HoBoIs at users.noreply.github.com>
Date: Wed, 18 Oct 2023 18:05:01 +0200
Subject: [PATCH 1/3] Correct end for the CastOperation.OpRange

Set the correct end for the CastOperation.OpRange in CXXFunctionalCastExpr. Now it is the closing bracket's location instead of the parameter's location.
---
 clang/lib/Sema/SemaCast.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Sema/SemaCast.cpp b/clang/lib/Sema/SemaCast.cpp
index 98b5879456e2175..87e6d1a2198fcea 100644
--- a/clang/lib/Sema/SemaCast.cpp
+++ b/clang/lib/Sema/SemaCast.cpp
@@ -3362,7 +3362,7 @@ ExprResult Sema::BuildCXXFunctionalCastExpr(TypeSourceInfo *CastTypeInfo,
   assert(LPLoc.isValid() && "List-initialization shouldn't get here.");
   CastOperation Op(*this, Type, CastExpr);
   Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
-  Op.OpRange = SourceRange(Op.DestRange.getBegin(), CastExpr->getEndLoc());
+  Op.OpRange = SourceRange(Op.DestRange.getBegin(), RPLoc);
 
   Op.CheckCXXCStyleCast(/*FunctionalCast=*/true, /*ListInit=*/false);
   if (Op.SrcExpr.isInvalid())

>From c5b49768eaa4f4ceab110a9fc35a9fa0924409f3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Botond=20Istv=C3=A1n=20Horv=C3=A1th?=
 <56926027+HoBoIs at users.noreply.github.com>
Date: Thu, 19 Oct 2023 13:47:47 +0200
Subject: [PATCH 2/3] Added a test to misc-source-ranges.cpp

---
 clang/test/Misc/misc-source-ranges.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/clang/test/Misc/misc-source-ranges.cpp b/clang/test/Misc/misc-source-ranges.cpp
index 7a9d9d057dac407..5bc50f7a4281072 100644
--- a/clang/test/Misc/misc-source-ranges.cpp
+++ b/clang/test/Misc/misc-source-ranges.cpp
@@ -1,7 +1,13 @@
-// RUN: not %clang_cc1 -fsyntax-only -fdiagnostics-print-source-range-info %s 2>&1 | FileCheck %s
+// RUN: not %clang_cc1 -fsyntax-only -fdiagnostics-print-source-range-info -Wcast-function-type-strict %s 2>&1 | FileCheck %s
 
 struct S {
   char a : 12 - 12;
 };
 // CHECK: misc-source-ranges.cpp:[[@LINE-2]]:8:{[[@LINE-2]]:12-[[@LINE-2]]:19}
 
+using fun = long(*)(int&);
+fun foo(){
+  long (*f_ptr)(const int&);
+  return fun(f_ptr);
+}
+// CHECK: misc-source-ranges.cpp:[[@LINE-2]]:10:{[[@LINE-2]]:10-[[@LINE-2]]:20}

>From bc65adadd2cb605b5655223a6781de746d534b2d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Botond=20Istv=C3=A1n=20Horv=C3=A1th?=
 <56926027+HoBoIs at users.noreply.github.com>
Date: Fri, 20 Oct 2023 11:12:59 +0200
Subject: [PATCH 3/3] Update ReleaseNotes.rst

---
 clang/docs/ReleaseNotes.rst | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index eee48431d716878..4b67a5dce0945d3 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -326,6 +326,25 @@ Improvements to Clang's diagnostics
 - Clang now always diagnoses when using non-standard layout types in ``offsetof`` .
   (`#64619: <https://github.com/llvm/llvm-project/issues/64619>`_)
 
+- When describing a warning/error in a function-style type converson clang underscored only until
+  the end of the expression we convert from. Now clang underscores the until the closing bracket.
+
+  Before:
+
+  .. code-block:: text
+
+    warning: cast from 'long (*)(const int &)' to 'decltype(fun_ptr)' (aka 'long (*)(int &)') converts to incompatible function type [-Wcast-function-type-strict]
+    24 | return decltype(fun_ptr)( f_ptr /*comment*/);
+       |        ^~~~~~~~~~~~~~~~~~~~~~~~
+
+  After:
+
+  .. code-block:: text
+
+    warning: cast from 'long (*)(const int &)' to 'decltype(fun_ptr)' (aka 'long (*)(int &)') converts to incompatible function type [-Wcast-function-type-strict]
+    24 | return decltype(fun_ptr)( f_ptr /*comment*/);
+       |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
 Bug Fixes in This Version
 -------------------------
 - Fixed an issue where a class template specialization whose declaration is