Hi Serguey,
I'm afraid there's no easy way we can help - both the problems you
mention are known limitations of programming with Epigram 1.
Yes - you can only undo the last change you made. There's no way to
edit code once you've hit escape. The only thing to do is copy the
entire buffer to *scratch*, make the changes you want, reset the
Epigram buffer, and try again. The same trick works if you want to
add a data constructor (although you may need to rewrite all the
functions you wrote using this data type as there is now a new
constructor).
If you want to do any serious development using Epigram, you may want
to look at Agda 2 (http://appserv.cs.chalmers.se/users/ulfn/wiki/
agda.php) instead - it's a lot more stable and better supported than
Epigram 1 is at the moment. A lot of our effort is focussed on
developing a new version of Epigram, instead of maintaining the old one.
Hope this helps,
Wouter
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