Fix cppcheck debug warning

Author: Your Name

lib/checkclass.cpp

@@ -2334,6 +2334,10 @@ bool CheckClassImpl::isMemberVar(const Scope *scope, const Token *tok) const
         if (Token::Match(tok->tokAt(-3), "%name% ) . %name%")) {
             tok = tok->tokAt(-3);
             again = true;
+        } else if (Token::Match(tok->tokAt(-2), ") . %name%")) {
+            // function call chain: the member is accessed through the return value
+            tok = tok->linkAt(-2)->previous();
+            again = true;
         } else if (Token::Match(tok->tokAt(-2), "%name% . %name%")) {
             tok = tok->tokAt(-2);
             again = true;

test/testclass.cpp

@@ -228,6 +228,7 @@ class TestClass : public TestFixture {
         TEST_CASE(constRefQualified);
         TEST_CASE(staticArrayPtrOverload);
         TEST_CASE(qualifiedNameMember); // #10872
+        TEST_CASE(memberVarCallChain);
 
         TEST_CASE(initializerListOrder);
         TEST_CASE(initializerListArgument);
@@ -7856,6 +7857,19 @@ class TestClass : public TestFixture {
         ASSERT_EQUALS("[test.cpp:4:10] -> [test.cpp:6:9]: (style, inconclusive) Technically the member function 'S::f' can be const. [functionConst]\n", errout_str());
     }
 
+    void memberVarCallChain() { // member variable accessed through a function call chain
+        const Settings s = settingsBuilder().severity(Severity::style).debugwarnings().library("std.cfg").certainty(Certainty::inconclusive).build();
+        checkConst("struct S {\n"
+                   "    std::string nodeType;\n"
+                   "    std::vector<std::shared_ptr<S>> children;\n"
+                   "    bool f();\n"
+                   "};\n"
+                   "bool S::f() {\n"
+                   "    return !children.empty() && children.back()->nodeType == \"Foo\";\n"
+                   "}\n", s);
+        ASSERT_EQUALS("[test.cpp:4:10] -> [test.cpp:6:9]: (style, inconclusive) Technically the member function 'S::f' can be const. [functionConst]\n", errout_str());
+    }
+
 #define checkInitializerListOrder(...) checkInitializerListOrder_(__FILE__, __LINE__, __VA_ARGS__)
     template<size_t size>
     void checkInitializerListOrder_(const char* file, int line, const char (&code)[size]) {