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ErgoScript is a text, usually placed in strings (in string literals to be precise). It is not possible to put a breakpoint in strings.

However, ErgoScript is a subset of Scala (by design) and there is a comprehensive test suite (see SigmaDslSpecification) that checks ErgoScript - Scala equivalence. There is an example in sigmastate-interpreter repo

AssetsAtomicExchange.scala#L29 which demonstrate debugging capability.

Put a breakpoint on the line above and then do debug run of this test.

It should stop on the breakpoint.