From 585b9a0c33e17b0300ace15d707b977b605c0839 Mon Sep 17 00:00:00 2001
From: chrchr-github <noreply@github.com>
Date: Mon, 25 May 2026 21:40:16 +0200
Subject: [PATCH 1/2] Fix  #14783 FN unusedVariable with templated type
 (default constructor, regression)

---
 lib/checkunusedvar.cpp |  4 ----
 test/testunusedvar.cpp | 10 ++++++++++
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/lib/checkunusedvar.cpp b/lib/checkunusedvar.cpp
index 6dd98de078e..eb533bbe692 100644
--- a/lib/checkunusedvar.cpp
+++ b/lib/checkunusedvar.cpp
@@ -1160,10 +1160,6 @@ void CheckUnusedVar::checkFunctionVariableUsage_iterateScopes(const Scope* const
                         variables.read(tok2->varId(), tok);
                 }
             }
-        } else if (tok->variable() && tok->variable()->isClass() && tok->variable()->type() &&
-                   (tok->variable()->type()->needInitialization == Type::NeedInitialization::False) &&
-                   tok->strAt(1) == ";") {
-            variables.write(tok->varId(), tok);
         }
     }
 }
diff --git a/test/testunusedvar.cpp b/test/testunusedvar.cpp
index 13d288a3fdd..353be88fb26 100644
--- a/test/testunusedvar.cpp
+++ b/test/testunusedvar.cpp
@@ -7070,6 +7070,15 @@ class TestUnusedVar : public TestFixture {
                               "    S<0> s;\n"
                               "}\n");
         ASSERT_EQUALS("[test.cpp:6:10]: (style) Unused variable: s [unusedVariable]\n", errout_str());
+
+        functionVariableUsage("template <typename T>\n"
+                              "struct A {\n"
+                              "    A() = default;\n"
+                              "};\n"
+                              "void f() {\n"
+                              "    A<int> a;\n"
+                              "}\n");
+        ASSERT_EQUALS("[test.cpp:6:12]: (style) Unused variable: a [unusedVariable]\n", errout_str());
     }
 
     void localvarFuncPtr() {
@@ -7158,6 +7167,7 @@ class TestUnusedVar : public TestFixture {
                               "void f() {\n"
                               "    Y y;\n"
                               "}"); // #4695
+        ASSERT_EQUALS("[test.cpp:6:7]: (style) Unused variable: y [unusedVariable]\n", errout_str());
     }
 
     void crash3() {

From e95639c693381222ac39478ffab607ad6b9376b2 Mon Sep 17 00:00:00 2001
From: chrchr-github <noreply@github.com>
Date: Mon, 25 May 2026 21:42:32 +0200
Subject: [PATCH 2/2] Comment

---
 test/testunusedvar.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/testunusedvar.cpp b/test/testunusedvar.cpp
index 353be88fb26..5905c29b36f 100644
--- a/test/testunusedvar.cpp
+++ b/test/testunusedvar.cpp
@@ -7071,7 +7071,7 @@ class TestUnusedVar : public TestFixture {
                               "}\n");
         ASSERT_EQUALS("[test.cpp:6:10]: (style) Unused variable: s [unusedVariable]\n", errout_str());
 
-        functionVariableUsage("template <typename T>\n"
+        functionVariableUsage("template <typename T>\n" // #14783
                               "struct A {\n"
                               "    A() = default;\n"
                               "};\n"