Tokenizer: Bailout if @ is encountered in the code

lib/tokenize.cpp

@@ -2169,6 +2169,18 @@ bool Tokenizer::tokenize(std::istream &code,
     // Remove __asm..
     simplifyAsm();
 
+    // When the assembly code has been cleaned up, no @ is allowed
+    for (const Token *tok = _tokens; tok; tok = tok->next())
+    {
+        if (tok->str() == "(")
+            tok = tok->link();
+        else if (tok->str()[0] == '@')
+        {
+            deallocateTokens();
+            return false;
+        }
+    }
+
     // Remove "volatile", "inline", "register", and "restrict"
     simplifyKeyword();
 

test/testtokenize.cpp

@@ -50,6 +50,7 @@ private:
         TEST_CASE(tokenize10);
         TEST_CASE(tokenize11);
         TEST_CASE(tokenize12);
+        TEST_CASE(tokenize13);  // bailout if the code contains "@" - that is not handled well.
 
         // don't freak out when the syntax is wrong
         TEST_CASE(wrong_syntax);
@@ -469,6 +470,16 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    // bailout if there is "@" - it is not handled well
+    void tokenize13()
+    {
+        const char code[] = "@implementation\n"
+                            "-(Foo *)foo: (Bar *)bar\n"
+                            "{ }\n"
+                            "@end\n";
+        ASSERT_EQUALS("", tokenizeAndStringify(code));
+    }
+
     void wrong_syntax()
     {
         {