[Agda] Shadowing definitions

[Thorsten Altenkirch]

Thanks for the tip.

This works but usually the 2nd definition is a slight modification of the first. E.g. first I show how constructors can be derived and then I mention that one can use the constructor keyword…

Thorsten

From: Philip Wadler <wadler at inf.ed.ac.uk>
Date: Sunday, 2 August 2020 at 13:59
To: Thorsten Altenkirch <psztxa at exmail.nottingham.ac.uk>
Cc: "agda at lists.chalmers.se" <agda at lists.chalmers.se>
Subject: Re: [Agda] Shadowing definitions

Thorsten, would the following trick work? Go well, -- P

\definemacro{\mydef}{
\begin{code}
answer = 42
\end{code}

... first use of definition ...
\mydef
... second use of same definition ...
\mydef


.   \ Philip Wadler, Professor of Theoretical Computer Science,
.   /\ School of Informatics, University of Edinburgh
.  /  \ and Senior Research Fellow, IOHK
. http://homepages.inf.ed.ac.uk/wadler/



On Sun, 2 Aug 2020 at 13:16, Thorsten Altenkirch <Thorsten.Altenkirch at nottingham.ac.uk<mailto:Thorsten.Altenkirch at nottingham.ac.uk>> wrote:
Hi guys,

I am currently working on my book “The Tao of Types” and I am now using literate agda and lhs2tex with agda mode . One issue is that for pedagogical reasons I like to repeat definitions but agda doesn’t allow this. Ok, I can declare the first definition as a spec which means it is ingnored by literate agda. I don’t really like this because it means that there is no type checking for the first definition. Also in some cases this doesn’t work and I have to go through all sort of tricks to make the code work. Is there a workaround, or would it be possible to allow shadowing (unsafely)?

Btw, another problem I have is to switch between agda-mode and latex-mode in emacs. I discovered that C-C C-n in latex mode switches to agda mode (not sure why) is there a key combination to switch from agda to latex?

Cheers,
Thorsten

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