[Agda] case ((a , b) , (c , d))
Nils Anders Danielsson
nad at cse.gu.se
Mon Nov 11 15:16:59 CET 2013
On 2013-11-11 14:51, Sergei Meshveliani wrote:
> Please, what is wrong here?
> f : ℕ → ℕ
> f n = case ( (n , suc n) , (suc n , suc (suc n)) )
> of \
> { ( (zero , zero) , _ ) → zero
> ; ( _ , (zero , zero) ) → zero
> }
If you test the following code, then you can see that Agda doesn't infer
all of the implicit arguments in your case scrutinee:
f : ℕ → ℕ
f n = case ( (n , suc n) , (suc n , suc (suc n)) )
of ?
The most recent development version of Agda highlights unsolved
meta-variables and errors at the same time; perhaps this will make it
easier to understand errors caused by unsolved meta-variables.
You can fix your code by replacing some of the commas with _,′_:
f n = case ( (n , suc n) ,′ (suc n ,′ suc (suc n)) )
of ?
--
/NAD
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