Misleading message about extensions #574
Description
ghc-options:
- -XViewPatterns
Warning: Instead of 'ghc-options: -XViewPatterns' use 'extensions: ViewPatterns'
However, adding extensions field to package.yaml generates another warning:
WARNING: Ignoring unknown field "extensions" in package description
What works is default-extensions: ViewPatterns.
This ticket is to change the misleading warning message about the extensions field that doesn't exist.