From 5e524561061ba33843add2ad94beccf75fa203de Mon Sep 17 00:00:00 2001
From: Daniel Tabacaru <daniel.tabacaru9@gmail.com>
Date: Thu, 2 Jun 2022 14:38:27 +0200
Subject: [PATCH 1/2] Fix MSVC runtime check failure

---
 src/realm/sync/changeset_encoder.cpp | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/src/realm/sync/changeset_encoder.cpp b/src/realm/sync/changeset_encoder.cpp
index ed3d3f098fa..328b7dd0364 100644
--- a/src/realm/sync/changeset_encoder.cpp
+++ b/src/realm/sync/changeset_encoder.cpp
@@ -8,18 +8,19 @@ void ChangesetEncoder::operator()(const Instruction::AddTable& instr)
 {
     auto spec = mpark::get_if<Instruction::AddTable::TopLevelTable>(&instr.type);
     const bool is_embedded = (spec == nullptr);
-    auto convert = util::overload{
-        [&](const Instruction::AddTable::TopLevelTable& spec) {
-            if (spec.is_asymmetric) {
-                return Table::Type::TopLevelAsymmetric;
-            }
-            return Table::Type::TopLevel;
-        },
-        [&](const Instruction::AddTable::EmbeddedTable&) {
-            return Table::Type::Embedded;
-        },
-    };
-    auto table_type_int = static_cast<uint8_t>(mpark::visit(convert, instr.type));
+    Table::Type table_type;
+    if (!is_embedded) {
+        if (spec->is_asymmetric) {
+            table_type = Table::Type::TopLevelAsymmetric;
+        }
+        else {
+            table_type = Table::Type::TopLevel;
+        }
+    }
+    else {
+        table_type = Table::Type::Embedded;
+    }
+    auto table_type_int = static_cast<uint8_t>(table_type);
     append(Instruction::Type::AddTable, instr.table, table_type_int);
     if (!is_embedded) {
         append_value(spec->pk_field);

From 3b15fdb29412d5860d03ed659175fa677e4aac67 Mon Sep 17 00:00:00 2001
From: Daniel Tabacaru <daniel.tabacaru9@gmail.com>
Date: Thu, 2 Jun 2022 14:55:58 +0200
Subject: [PATCH 2/2] Update changelog

---
 CHANGELOG.md | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d40b80d238..31fa85fea16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,8 +5,7 @@
 * None.
 
 ### Fixed
-* <How do the end-user experience this issue? what was the impact?> ([#????](https://github.com/realm/realm-core/issues/????), since v?.?.?)
-* None.
+* Fixed a segfault in sync compiled by MSVC 2022. ([#5557](https://github.com/realm/realm-core/pull/5557), since 12.1.0)
  
 ### Breaking changes
 * None.