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Yves Parès

1 Dec 2011 1 Dec '11

9:10 a.m.

Hey, What do you mostly use for debugging? Simple calls to Debug.Trace.trace? Hpc? Hood?

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Ivan Lazar Miljenovic

1 Dec 1 Dec

9:19 a.m.

On 2 December 2011 01:10, Yves Parès wrote:

Hey,

What do you mostly use for debugging? Simple calls to Debug.Trace.trace? Hpc? Hood?

trace and ghci. -- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com

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Andrew Butterfield

10:24 a.m.

On 1 Dec 2011, at 14:10, Yves Parès wrote:

Hey,

What do you mostly use for debugging? Simple calls to Debug.Trace.trace? Hpc? Hood?

Debug.Trace, with some short helpers so dbg "x=" x displays the value of x, provided x is in Show import Debug.Trace dbg msg x = dbgsh show msg x dbgsh sh msg x = trace (msg++sh x) x cdbg p msg x | p x = dbg msg x | otherwise = x -- if you want to tailor the "show": class Dshow t where dshow :: t -> String ddbg msg x = dbgsh dshow msg x

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Rustom Mody

2 Dec 2 Dec

8:59 a.m.

On Thu, Dec 1, 2011 at 7:40 PM, Yves Parès wrote:

Hey,

What do you mostly use for debugging? Simple calls to Debug.Trace.trace? Hpc? Hood?

I also wonder about 'type-debugging' Using ghci: For a top level expression: - if it is not compiling I can put in (or remove) a type decl and see how things change. - if it is compiling I can of course ":t it" But for internal expressions it can be quite hairy to figure out why what haskell thinks is the type of something and what I think dont match. So is there something like type-intellisense for haskell where if one hovers the mouse (maybe over a selection) haskell tells what type it finds there?

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Yves Parès

10:28 a.m.

But for internal expressions it can be quite hairy to figure out why what haskell thinks is the type of something and what I think dont match.

^^ Just give the internal expression a type you know to be wrong, then GHC will display the infered type and say it doesn't match the one you wrote. 2011/12/2 Rustom Mody

On Thu, Dec 1, 2011 at 7:40 PM, Yves Parès wrote:

...
Hey,

What do you mostly use for debugging? Simple calls to Debug.Trace.trace? Hpc? Hood?

I also wonder about 'type-debugging'

Using ghci: For a top level expression: - if it is not compiling I can put in (or remove) a type decl and see how things change. - if it is compiling I can of course ":t it"

But for internal expressions it can be quite hairy to figure out why what haskell thinks is the type of something and what I think dont match.

So is there something like type-intellisense for haskell where if one hovers the mouse (maybe over a selection) haskell tells what type it finds there?

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Andrew Butterfield
Ivan Lazar Miljenovic
Rustom Mody
Yves Parès