Update README.hs

haskell/developers-roadmap/README.hs

@@ -321,6 +321,19 @@ ex2 = runQ [d|decl :: Int; decl = 1 + 2|]
 
 - [rzk-lang/rzk](https://github.com/rzk-lang/rzk) - see `flake.nix`
 
+## Compiler
+
+### GHC
+
+- GHC typechecks on AST that stores position information ([SO](https://stackoverflow.com/a/27348974))
+- Haskell parser keeps location info ([link](https://gitlab.haskell.org/ghc/ghc/-/blob/master/compiler/GHC/Parser.y))
+
+### Parsing
+
+- Parsing with Haskell
+  - [Part 1](https://serokell.io/blog/lexing-with-alex)
+  - [Part 2](https://serokell.io/blog/parsing-with-happy)
+
 ## Nix
 
 - To keep completions in [share](https://github.com/NixOS/cabal2nix/issues/433#issuecomment-862557347), need to modify [justStaticExecutables](https://github.com/NixOS/nixpkgs/blob/c032f4a16c1d09533c8af71002d5e7ad2d85af60/pkgs/development/haskell-modules/lib/compose.nix#L288C8-L288C8) 
@@ -330,8 +343,6 @@ so that it doesn't remove `share`.
 
 - [Радости и горести побед над C: делаем конфетку из прототипа wc на хаскеле](https://habr.com/ru/articles/496370/)
   - [hwc](https://github.com/0xd34df00d/hwc/tree/master)
-- Parsing with Haskell
-  - [Part 1](https://serokell.io/blog/lexing-with-alex)
 - Haskell CI with caching - [src](https://github.com/aaronallen8455/breakpoint/blob/main/.github/workflows/ci.yml)
 - `string-interpolate` - [src](https://hackage.haskell.org/package/string-interpolate)
   - UTF-8 string interpolation