[GHC Proposal #143 "Remove the * kind syntax"](https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0143-remove-star-kind.rst) specifies the following plan: > * In the next release (or 0.5 years in), GHC 8.8, add `-fwarn-star-is-type` to `-Wcompat`. > * For one more release, do nothing. At this point, the warning has been available for three releases (GHC 8.6, GHC 8.8, GHC 8.10), and included in `-Wcompat` for the last two. > * In the next release (or 1.5 years in), add `-fwarn-star-is-type` to `-Wall`. > * For two more releases, do nothing. > * In the next release (or 3 years in), enable `-fwarn-star-is-type` by default. > * ... We included `-Wstar-is-type` in `-Wall` in 9.0. Skipped two releases: 9.2, 9.4. The next step is to enable `-Wstar-is-type` by default in 9.6.