Re: [Haskell-cafe] Haskell Debugging

15 Nov 2006

      On 14.11.2006 23:17 Cale Gibbard wrote:
...
On 13/11/06, Valentin Gjorgjioski  wrote:
...
Following example
import Hugs.Observe
ex8 :: [Float]
ex8 = (observe "after reverse" ) reverse  [10.0,7.0,3.0,0.0,4.0]
gives me
...
ex8
[4.0,0.0,3.0,7.0,10.0]
...
...
...
...
>>> Observations <<<<<<
after reverse
   { \ ($-990871 : $-990888 : $-990905 : $-990922 : $-990939 : [])  ->
$-990939 : $-990922 : $-990905 : $-990888 : $-990871 : []
   }
First of all, I don't get this behaviour in Hugs 20050308 on Ubuntu.
Main> ex8
[4.0,0.0,3.0,7.0,10.0]
...
...
...
...
...
>> Observations <<<<<<
after reverse
 { \ (10.0 : 7.0 : 3.0 : 0.0 : 4.0 : [])  -> 4.0 : 0.0 : 3.0 : 7.0 : 
10.0 : []
 }
Just one more thing
If I write

ex9 :: [Float]
ex9 = (observe "after reverse" )  reverse  [10.0,7.0,3.0,0.0,4.0]

it doesn't work. If I delete ex9 :: [Float] then it works fine. any 
suggestions?