Symbols to the left of the line numbers alert you that something might be wrong with your code.
- A red shape with an X indicates an error. Your code will not be able to run.
- A yellow shape with an ! indicates a warning or suggestion. Your code will run but it might not work as you had planned.
- A small i gives information about a small issue. Your code will be able to run. Correcting these issues will improve the reliability and the readability of your work.
Hover your mouse over the symbols to see more information.