"Structural pattern matching" for Python, part 2

Indeed. I discussed this issue with a friend who has developed in Scala. He told me that in what he understood from the article -- and what I completely missed -- is that if I want error reporting, I may simply have to use

case x:
print("error: ", str(x))

an not use the `_` (which isn't meant to be used).

match t:
    ...
    case _:
        print("error: ", str(t))

match t := some_expr():
    case ...:
    case _:
        # use t