Useful GHC flags

package.yaml

# NOTE:
# For details on warnings: https://downloads.haskell.org/~ghc/master/users-guide/using-warnings.html
#
# This list taken from https://medium.com/mercury-bank/enable-all-the-warnings-a0517bc081c3
ghc-options:
  - -fwarn-tabs                      # Warn on tabs (spaces are better)

  - -Weverything                     # Enable all warnings with -Weverything, then
                                     # disable the ones we don’t care about

  - -Wno-missing-exported-signatures # Turns off the more strict -Wmissing-signatures.
                                     # See https://ghc.haskell.org/trac/ghc/ticket/14794#ticket

  - -Wno-missing-import-lists        # Requires explicit imports of _every_ function
                                     # (e.g. ‘$’); too strict

  - -Wno-missed-specialisations      # When GHC can’t specialize a polymorphic
                                     # function. No big deal and requires fixing
                                     # underlying libraries to solve.

  - -Wno-all-missed-specialisations  # See missed-specialisations

  - -Wno-unsafe                      # Don’t use Safe Haskell warnings

  - -Wno-safe                        # Don’t use Safe Haskell warnings

  - -Wno-missing-local-signatures    # Warning for polymorphic local bindings; nothing
                                     # wrong with those.

  - -Wno-monomorphism-restriction    # Don’t warn if the monomorphism restriction is used

  - -Wno-unused-do-bind              # Allow one-line do blocks