Thank you for pointing that out. When you press Enter, everything is parsed, including the current line. The current line will only be accepted if it is syntac

Thank you for pointing that out. When you press Enter, everything is parsed, including the current line. The current line will only be accepted if it is syntactically correct. Normally this works quite well, but for beginners this can be a real problem. With "Ctrl-R" you can see the error. I need to think about how to improve this.