[Agda] how to evaluate in the current context

[Thorsten Altenkirch]

Hi,

I have come across this little nuisance when using agda especially when doing life hacking in lectures or talks.

I try to evaluate an expression which depends on opening some modules which I have opened in my file but agda is not aware of this. E.g.

record Stream (A : Set) : Set where
  constructor _∷_
  coinductive
  field
    hd : A
    tl : Stream A

open Stream

from : ℕ → Stream ℕ
hd (from n) = n
tl (from n) = from (suc n)

And then I say C-c C-n “hd (from 0)” and agda responds

1,1-3
Not in scope:
  hd at 1,1-3 (did you mean 'Stream.hd'?)
when scope checking hd

Ok I can just introduce a shed

x = {!!}

and evaluate inside there but this is a bit clumsy. Isn’t there a better way to do this?

Btw, for the same purposes I’d love to have an agda top-level! And a printer that evaluates conductive objects by mapping them to costrings…

Thorsten

P.S. Ok I can say “open Stream public” – but do I want this?




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