[clang] [analyzer] Add documentation for std::variant checker (PR #76501)

[Gábor Spaits via cfe-commits]

https://github.com/spaits updated https://github.com/llvm/llvm-project/pull/76501

>From c1884cc4d17c446491777baa43e3996aae22ad0d Mon Sep 17 00:00:00 2001
From: Gabor Spaits <gaborspaits1 at gmail.com>
Date: Thu, 28 Dec 2023 14:17:55 +0100
Subject: [PATCH 1/2] [analyzer] Add documentation for std::variant checker

---
 clang/docs/analyzer/checkers.rst | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/clang/docs/analyzer/checkers.rst b/clang/docs/analyzer/checkers.rst
index 81d40395067c9a..272e1965335ed3 100644
--- a/clang/docs/analyzer/checkers.rst
+++ b/clang/docs/analyzer/checkers.rst
@@ -2097,6 +2097,21 @@ This checker is a part of ``core.StackAddressEscape``, but is temporarily disabl
 
 .. _alpha-core-TestAfterDivZero:
 
+alpha.core.StdVariant (C++)
+"""""""""""""""""""""""""""
+Check if a value of active type is retrieved from an ``std::variant`` instance with ``std::get``.
+In case of bad variant type access(the accessed type differs from the active type)
+a warning is emitted. Currently this checker does not take exception handling into account.
+
+.. code-block:: cpp
+
+ void test() {
+   std::variant <int, char> v = 25;
+   char c = stg::get<char>(v); // warn
+ }
+
+.. _alpha-core-StdVariant:
+
 alpha.core.TestAfterDivZero (C)
 """""""""""""""""""""""""""""""
 Check for division by variable that is later compared against 0.

>From 240c34c0f9e11b5059cc57b44fd776584d2e768a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?G=C3=A1bor=20Spaits?=
 <48805437+spaits at users.noreply.github.com>
Date: Thu, 28 Dec 2023 16:41:07 +0100
Subject: [PATCH 2/2] Update clang/docs/analyzer/checkers.rst

Co-authored-by: DonatNagyE <donat.nagy at ericsson.com>
---
 clang/docs/analyzer/checkers.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/docs/analyzer/checkers.rst b/clang/docs/analyzer/checkers.rst
index 272e1965335ed3..7f5572c8c9c10c 100644
--- a/clang/docs/analyzer/checkers.rst
+++ b/clang/docs/analyzer/checkers.rst
@@ -2100,7 +2100,7 @@ This checker is a part of ``core.StackAddressEscape``, but is temporarily disabl
 alpha.core.StdVariant (C++)
 """""""""""""""""""""""""""
 Check if a value of active type is retrieved from an ``std::variant`` instance with ``std::get``.
-In case of bad variant type access(the accessed type differs from the active type)
+In case of bad variant type access (the accessed type differs from the active type)
 a warning is emitted. Currently this checker does not take exception handling into account.
 
 .. code-block:: cpp