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Update and simplify version support table #1028

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40 changes: 20 additions & 20 deletions docs/reference/supported-ghc-versions.md
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# Supported GHC Versions

This table shows which versions of GHC are defined, built by CI, and tested.
If you use a combination of nixpkgs version and GHC version which is built by our CI, you should get cache hits from our cache.

The "nixpkgs versions" refer to the versions that `haskell.nix` provides; if you use your own version of nixpkgs you will likely not get cache hit
The following GHC versions are defined in `haskell.nix` (i.e. there is a derivation for them even if it isn't necessarily cached):
- 8.4.4
- 8.6.{1,2,3,4,5}
- 8.8.{1,2,3,4}
- 8.10.{1,2,3}

| Nixpkgs version | GHC version | Defined? | Built? | Tested? |
| --------------- | ------------- | -------- | ------ | ------- |
| 20.03 | 8.4.4 | Y | N | N |
| 20.03 | 8.6.{1,2,3,4} | Y | N | N |
| 20.03 | 8.6.5 | Y | Y | Y |
| 20.03 | 8.8.{1,2,3} | Y | N | N |
| 20.03 | 8.8.4 | Y | N | N |
| 20.03 | 8.10.1 | Y | N | N |
| 20.03 | 8.10.2 | Y | N | N |
| 20.09 | 8.4.4 | Y | N | N |
| 20.09 | 8.6.{1,2,3,4} | Y | N | N |
| 20.09 | 8.6.5 | Y | Y | Y |
| 20.09 | 8.8.{1,2} | Y | N | N |
| 20.09 | 8.8.3 | Y | Y | N |
| 20.09 | 8.8.4 | Y | Y | Y |
| 20.09 | 8.10.1 | Y | Y | N |
| 20.09 | 8.10.2 | Y | Y | Y |
The following table shows the nixpkgs/GHC versions which are built by CI, and which of those are tested.
If you use a combination of nixpkgs version and GHC version which is in this table, you should get cache hits from our cache.
The "nixpkgs versions" refer to the versions that `haskell.nix` provides; if you use your own version of nixpkgs you will likely not get cache hit.

| Nixpkgs version | GHC version | Tested? |
|------------------|-------------|---------|
| 20.03 | 8.6.5 | Y |
| 20.09 | 8.6.5 | Y |
| 20.09 | 8.8.3 | N |
| 20.09 | 8.8.4 | Y |
| 20.09 | 8.10.2 | N |
| 20.09 | 8.10.3 | Y |
| nixpkgs-unstable | 8.6.5 | Y |
| nixpkgs-unstable | 8.8.4 | Y |
| nixpkgs-unstable | 8.10.3 | Y |

See [ci.nix](https://github.com/input-output-hk/haskell.nix/blob/master/ci.nix) for the source of truth about what is built and tested.

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