[Haskell-cafe] Where is Show for GHC AST?

Matthew Pickering matthewtpickering at gmail.com
Wed Apr 22 14:11:10 UTC 2020

You can use the `showAstData` function in order to view the AST. There
are also flags `-ddump-parsed-ast`, `-ddump-rn-ast` and
`-ddump-tc-ast` which can be used on the command line.



On Wed, Apr 22, 2020 at 6:03 AM Daneel Yaitskov <dyaitskov at gmail.com> wrote:
> Hi,
> I am trying to modify LiquidHaskell and want to see how source code
> is represented in AST format.
> I think I have AST i.e. HsExpr value, but there is no Show instance for that.
> I noticed that GHC classes implement similar class Outputable, but
> it doesn't do what I expected. It just reconstruct AST back to source code.
> I could probably write a TH function generating Show instances for all
> types which HsExpr depends on, but I hope there is more straight
> forward way to do that.
> And after all I curious what is the reason for not having Show for GHC
> AST types?
> It would be so convenient having Show.
> --
> Daneel S. Yaitskov
> Java Developer
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