Fix #10393 FP returnDanglingLifetime (#3562)

Author: chrchr-github

lib/symboldatabase.cpp

@@ -6538,6 +6538,11 @@ void SymbolDatabase::setValueTypeInTokenList(bool reportDebugWarnings, Token *to
                 setValueType(tok, valuetype);
             }
 
+            else if (Token::simpleMatch(tok->previous(), "= {") && tok->tokAt(-2) && tok->tokAt(-2)->valueType()) {
+                ValueType vt = *tok->tokAt(-2)->valueType();
+                setValueType(tok, vt);
+            }
+
             // library type/function
             else if (tok->previous()) {
                 if (tok->astParent() && Token::Match(tok->astOperand1(), "%name%|::")) {

test/testautovariables.cpp

@@ -2474,6 +2474,13 @@ class TestAutoVariables : public TestFixture {
               true);
         ASSERT_EQUALS("", errout.str());
 
+        check("std::string f(std::string s) {\n"
+              "    std::string r = { s.begin(), s.end() };\n"
+              "    return r;\n"
+              "}\n",
+              true);
+        ASSERT_EQUALS("", errout.str());
+
         check("struct A {\n"
               "    std::vector<std::unique_ptr<int>> mA;\n"
               "    void f(std::unique_ptr<int> a) {\n"