[SAOC 2024] Improve D Error Messages - Weekly Update #15

[Royal Simpson Pinto]

## Summary of Progress (December 23 – December 29)

This week, I worked on enabling `verrors=context` globally and 
handling challenges with `COMPILE` and `RUN` test files. I also 
started planning a resource for documenting errors to make it 
easier for users to understand and resolve issues.

### What I Worked On
- **Fixing `COMPILE` Test Files**:
   The approach of using `verrors=simple` globally in 
`d_do_test.d` didn’t work as expected for `COMPILE` files. For 
now, I updated only the necessary test files to keep things 
moving.
- **Investigating `RUN` Test Files**:
   Found that enabling `verrors=context` globally caused many 
`RUN` test files to behave differently. This wasn’t the case 
before in [PR #17085](https://github.com/dlang/dmd/pull/17085/). 
I’m still trying to figure out the exact issue.
- **Error Documentation Idea**:
   Started thinking about creating a website or documentation to 
include everything related to errors. I’ll need to gather data to 
get this started.

### Challenges
- Debugging the unexpected behavior in `RUN` files.

### Next Steps
1. Fix the test failures and complete the global enablement of 
`verrors=context`.
2. Collect data and draft plans for the error 
documentation/website.
3. Solve the issue causing inconsistencies in `RUN` files.

Happy New Year in advance! 🎉 Wishing for exciting progress and 
fewer bugs in the coming year! 😊