An excerpt of the configuration around a diagnostic's range.
- contextThe block the code is in, such as `resource "aws_instance" "web"`. Null when OpenTofu reported none.
- codeThe code around the range, possibly over several lines.
- startLineOne-based line in the file of the first line of `code`.
- highlightStartOffsetZero-based character offset into `code` of the start of the expression the diagnostic points at.
- highlightEndOffsetZero-based character offset into `code` of the end of the expression the diagnostic points at.
- Expression values that can explain the diagnostic. Empty when there are none.