14 Oct
2013
14 Oct
'13
8:57 a.m.
On Mon, Oct 14, 2013 at 6:51 PM, Kees Bleijenberg < k.bleijenberg@lijbrandt.nl> wrote:
The error at the problem line is: parse error on input `<-' ****
If I move the line above the ’if’ I get: Couldn't match expected type `CGIT IO t0' with actual type `IO [String]'. ****
Looks like you're missing a "do". You're writing code like this: if blah then x <- foo bar x else quux when you need to write if blah then do x <- foo bar x else quux Recommended exercises: * can you see in your mind's eye the desugaring of do-syntax? * how would you write it in a single line, i.e. without using indentation a.k.a. "layout" -- hint: look up curly braces -- Kim-Ee