Detect syntax error 'x ==> y'

lib/tokenize.cpp

@@ -9629,6 +9629,8 @@ void Tokenizer::findGarbageCode() const
         }
         if (Token::Match(tok, "[!|+-/%^~] )|]"))
             syntaxError(tok);
+        if (Token::Match(tok, "==|!=|<=|>= %comp%"))
+            syntaxError(tok, tok->str() + " " + tok->strAt(1));
     }
 
     // ternary operator without :

test/testtokenize.cpp

@@ -8027,6 +8027,9 @@ private:
                                              "  struct { int d; } port[1]; "
                                              "}; "
                                              "struct poc p = { .port[0] = {.d = 3} };"));
+
+        // op op
+        ASSERT_THROW_EQUALS(tokenizeAndStringify("void f() { dostuff (x==>y); }"), InternalError, "syntax error: == >");
     }