Manu wrote:
trying to compile gian's urblog (a bit of a personal obsession I must admit)
I get this formidable trace :

editor.ur:94:28-98:60: Expression is not a constructor function
Expression:
foldRX2[[(Type * Type)]] [fst[[Type]][[Type]]] [colMeta] [tr]

If you don't understand what the code is doing, then I don't recommend trying to compile it. Further changes breaking backward compatibility are likely, and I don't want to be responsible for tracking all of the code that already exists out there.

In this case, I think you want to put an @ before foldRX2 (with no space between) and remove the constructor application that occurs at the location the error message references.

Also, if this code is really copied from an official demo, please just copy the latest version of that demo, rather than asking here.

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