[Haskell-cafe] some way to reverse engineer lambda expressions out of the debugger?

tphyahoo tphyahoo at gmail.com
Sat Dec 30 03:53:53 EST 2006

I am a newbie learning haskell. (First forum post.)

I am wondering if there is a trick to get debugging information about
functions out of the environment (which for me, for now, is ghci).  

In this example, 

*UnixTools> :t map (*) [1,2]
map (*) [1,2] :: (Num a) => [a -> a]

This is very nice, but I would *really* like to see something like 

*UnixTools> explodeLambda( map (*) [1,2] )
[(\x -> 1*x),(\x -> 2*x)]

Yes, maybe I'm dreaming, but I would like haskell to reverse engineer /
pretty print lambda expressions for me.

(Note that: 

*UnixTools> map ($ 5 ) [(\x -> 1*x),(\x -> 2*x)]
*UnixTools> map ($ 5) ( map (*) [1..2] )

So these expressions really are the same, only it could be argued that the
first expression is in some sense easier to read if you are debugging
something complex.

I would like to have something like "Data::Dumper" from perl, but of course,
on steroids.

Is something like this possible, or be worked on? Or probably never going to

Cheers, thomas.
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