Tracking issue: internal error in target matching

[lf-]

Cabal currently displays an "internal error in target matching" message in cases where it should provide a more helpful error instead. This issue is tracking the known causes.

• "cabal: Internal error in target matching" (was: Internal error/infinite loop in D.Client.TargetSelector) #5081
• Baffling error messages for a package not being included in the project file #8484