Fix #14786 inconsistent unusedStructMember with std::unique_ptr

Author: web-flow

lib/checkunusedvar.cpp

@@ -1641,7 +1641,8 @@ void CheckUnusedVar::checkStructMemberUsage()
 
         for (const Variable &var : scope.varlist) {
             // only warn for variables without side effects
-            if (!(var.valueType() && var.valueType()->type >= ValueType::VOID) && !var.isPointer() && !astIsContainer(var.nameToken()) && !mTokenizer->getSymbolDatabase()->isRecordTypeWithoutSideEffects(var.type()))
+            if (!(var.valueType() && var.valueType()->type >= ValueType::VOID) && !var.isPointer() && !astIsContainer(var.nameToken()) &&
+                !astIsSmartPointer(var.nameToken()) && !mTokenizer->getSymbolDatabase()->isRecordTypeWithoutSideEffects(var.type()))
                 continue;
             if (isInherited && !var.isPrivate())
                 continue;

test/testunusedvar.cpp

@@ -2094,6 +2094,11 @@ class TestUnusedVar : public TestFixture {
                                "  std::int32_t i;\n"
                                "};\n");
         ASSERT_EQUALS("[test.cpp:2:16]: (style) struct member 'S::i' is never used. [unusedStructMember]\n", errout_str());
+
+        checkStructMemberUsage("struct S {\n" // #14786
+                               "  std::unique_ptr<int> p;\n"
+                               "};\n");
+        ASSERT_EQUALS("[test.cpp:2:24]: (style) struct member 'S::p' is never used. [unusedStructMember]\n", errout_str());
     }
 
     void structmember_macro() {