Scatter instance Prettys again with .hs-boot
#847
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My first plan was to place all `instance Pretty`s in `HIndent.Pretty` to remove existing instances for GHC's AST while not being affected by the AST's recursive structure, but it turned out that even our own AST couldn't avoid the recursive structure. Thus, I scatter the instances again with a `.hs-boot` file.
mihaimaruseac
approved these changes
Mar 16, 2024
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Description of the PR
It turned out that we couldn't place
instance Prettys in each AST nodemodule without allowing the circular dependency because of the recursive
structure of Haskell's AST, unfortunately.
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