User interface > Debugging and executing > Mark recognized/expected token
If the program is executed step by step, not only the actual node in the syntax tree is marked, but also the actual position in the input text. You can choose between a selection of the last recognized token and the token, which is expected next. This choice is most comfortably carried out via a tool button. If the button is up
the last recognized part of text remains marked, until the next terminal node in the syntax tree has been passed.
If the button is pressed, then immediately after a token was recognized, the text section that corresponds to the expected next token is marked.
