"Diagnostics: reporting errors and lints"

[nikomatsakis]

We should talk first about:

• Guidelines for emitting errors
  • How to find an error code and add an extended error
  • Conventions are how the error should be formatted (lowercase letter, etc)
    • link or maybe just inline the RFC with guidelines on how extended errors should look
  • when to use span_label etc
• How to emit lints
  • When to use a lint
  • If you have a tcx
  • Before you have a tcx
  • Some tips here at the end of Rustc bug fix procedure

EDIT(mark-i-m): See #14 (comment)

cc @estebank

[Karrq]

Looks to me like this issue is currently missing the following:

Errors:

• How to find an error code and add an extended error
• Conventions are how the error should be formatted (lowercase letter, etc)
• when to use span_label etc

Lints:
Nothing? Maybe the section about removing lints present in the rustc Bug Fix Procedure could be added.

[phansch]

It might also be nice to link to the lint naming recommendations rules from RFC0344