Map errors to code more accurately

[reprogrammer]

Currently, the tool uses the selected piece of the code (marked as ^) in the reported error message to map the error to the relevant piece of code. This makes the mapping inaccurate because of the occurrence of the selected piece of code in multiple locations. I think the mapping would be more accurate if we use a larger code snippet to map the error to the source code. How about using the whole code snippet reported in the error message to map it to the source code?

[reprogrammer]