Don't set type for simplified using declarations (f'up to #8454) (#6088)

Author: chrchr-github

lib/symboldatabase.cpp

@@ -390,7 +390,7 @@ void SymbolDatabase::createSymbolDatabaseFindAllScopes()
         }
 
         // using type alias
-        else if (mTokenizer.isCPP() && tok->isKeyword() && Token::Match(tok, "using %name% =")) {
+        else if (mTokenizer.isCPP() && tok->isKeyword() && Token::Match(tok, "using %name% =") && !tok->tokAt(2)->isSimplifiedTypedef()) {
             if (tok->strAt(-1) != ">" && !findType(tok->next(), scope)) {
                 // fill typeList..
                 typeList.emplace_back(tok, nullptr, scope);

test/testsymboldatabase.cpp

@@ -421,6 +421,7 @@ class TestSymbolDatabase : public TestFixture {
         TEST_CASE(symboldatabase102);
         TEST_CASE(symboldatabase103);
         TEST_CASE(symboldatabase104);
+        TEST_CASE(symboldatabase105);
 
         TEST_CASE(createSymbolDatabaseFindAllScopes1);
         TEST_CASE(createSymbolDatabaseFindAllScopes2);
@@ -5551,6 +5552,24 @@ class TestSymbolDatabase : public TestFixture {
         }
     }
 
+    void symboldatabase105() {
+        {
+            GET_SYMBOL_DB_DBG("template <class T>\n"
+                              "struct S : public std::deque<T> {\n"
+                              "    using std::deque<T>::clear;\n"
+                              "    void f();\n"
+                              "};\n"
+                              "template <class T>\n"
+                              "void S<T>::f() {\n"
+                              "    clear();\n"
+                              "}\n");
+            ASSERT(db != nullptr);
+            ASSERT_EQUALS("", errout.str());
+            const Token* const c = Token::findsimplematch(tokenizer.tokens(), "clear (");
+            ASSERT(!c->type());
+        }
+    }
+
     void createSymbolDatabaseFindAllScopes1() {
         GET_SYMBOL_DB("void f() { union {int x; char *p;} a={0}; }");
         ASSERT(db->scopeList.size() == 3);