ERROR: Undefined AST Node ASTBinaryOperator Sum (ASTNumber 1.0) (ASTNumber 1.0)

[juhp]

I am probably missing something...?
On Fedora 31:

 In[1]: 1 + 1

        ┌─────────────────────────────────────────────────────────────────────────────────┐
Out[1]: │ ERROR: Undefined AST Node ASTBinaryOperator Sum (ASTNumber 1.0) (ASTNumber 1.0) │
        └─────────────────────────────────────────────────────────────────────────────────┘

I tried building both with ghc-8.6.5/cabal-install and with stack...

(BTW I got here via https://twitter.com/smdiehl/status/1217009913500786689)

[g-belmonte]

@juhp I had the same issue. I solved it by using the code from another repo: http://codes.kary.us/nota/nota.git
I got the link to this repo taking a look at the install script mentioned on the project's homepage: https://kary.us/nota/
Have fun!