Troubleshooting

Firstly, you can use a debugger and debug the Scala code.

You can use log and trace functions to log messages to the execution log.

And there is a ? operator that can be used to log the value of a boolean expression when it is false.


import scalus.builtin.Builtins.trace
import scalus.prelude.*
import scalus.prelude.log
import scalus.uplc.eval.PlutusVM
given PlutusVM = PlutusVM.makePlutusV3VM()
val sir = compile {
    val a = trace("a")(BigInt(1))
    val b = BigInt(2)
    log("Checking if a == b")
    val areEqual = a == b
    areEqual.? // logs "areEqual ? False"
}.toUplc().evaluateDebug.toString