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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 the sigmastate-interpreter repo AssetsAtomicExchange.scala#L29, which demonstrates debugging capability.

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

It should stop at the breakpoint.