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3 kinds of yadda

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From:
Parrot Raiser
Date:
September 10, 2018 19:04
Subject:
3 kinds of yadda
Message ID:
CACwLAp9taj7HrKKQ=RH6zF6N9F=BzAt-rj20s+76p1EnUACMLg@mail.gmail.com
There are 3 kinds of yadda, yadda operator:

!!! dies with a message: Stub code executed
  in block <unit> at yad1 line 2

... dies with an identical message

??? produces the message, but continues operating.

The only difference I can find between !!! and ... is that !!!
produces bizarre behaviour  when run from the command line. (Bash
appears to be editing the code before P6 sees it.)

What is supposed to be the difference between !!! and ...? (And bonus
points if you can explain what bash is doing.)

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