Fixed #2488 (false positive with updating iterator in a for loop)

lib/checkstl.cpp

@@ -284,9 +284,13 @@ public:
         while (indentlevel > 0 && 0 != (tok = tok->next()))
         {
             if (tok->str() == "(")
-                ++indentlevel;
+                tok = tok->link();
             else if (tok->str() == ")")
-                --indentlevel;
+                break;
+
+            // reassigning iterator in loop head
+            else if (Token::Match(tok, "%var% =") && tok->str() == it->str())
+                break;
         }
 
         if (! Token::simpleMatch(tok, ") {"))

test/teststl.cpp

@@ -53,6 +53,7 @@ private:
         TEST_CASE(erase3);
         TEST_CASE(erase4);
         TEST_CASE(erase5);
+        TEST_CASE(erase6);
         TEST_CASE(eraseBreak);
         TEST_CASE(eraseContinue);
         TEST_CASE(eraseReturn1);
@@ -502,6 +503,20 @@ private:
         ASSERT_EQUALS("[test.cpp:8]: (error) Dangerous iterator usage after erase()-method.\n", errout.str());
     }
 
+    void erase6()
+    {
+        check("void f() {\n"
+              "    std::vector<int> vec(3);\n"
+              "    std::vector<int>::iterator it;\n"
+              "    std::vector<int>::iterator itEnd = vec.end();\n"
+              "    for (it = vec.begin(); it != itEnd; it = vec.begin(), itEnd = vec.end())\n"
+              "    {\n"
+              "        vec.erase(it);\n"
+              "    }\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void eraseBreak()
     {
         check("void f()\n"