[Haskell-cafe] coding standard question
magnus at therning.org
Mon Jun 22 01:35:34 EDT 2009
Erik de Castro Lopo wrote:
> Vasili I. Galchin wrote:
>> I am working with some existing code. "where/let" functions use the
>> same name for function parameters as the outer function and hence there is a
>> "shadow" warning from the compiler. To me it doesn't see totally
>> unreasonable to code like this .... the downside is the nasty ghc warnings.
>> Is there a coding consensus on this issue?
> I'm relatively new to Haskell, but I know that in imperative
> languages like C, a small percentage of "shadow" warnings are
> often real bugs and hence always worth fixing if possible
> (sometimes the problem is in system header files and hence
> can't be fixed).
> In Haskell there is an easy way around this. Variables can
> be name a, a', a'' and so on. Since these aid in clarity
> without forcing you to think up new variable names, I would
> suggest that its a good idea to fix these warnings.
Speaking from experience it's good to fix all warnings, since otherwise there
will be enough of them to cause a few "terminal pages" to scroll by when you
compile and then there's a real danger of not noticing real errors. I'd pass
'-Wall -Werror' to ghc to force myself to do this :-)
Also from experience, I get a good feeling about software that compiles
without warnings. It suggests the author cares and is indicative of some
level of quality.
Magnus Therning (OpenPGP: 0xAB4DFBA4)
magnus＠therning．org Jabber: magnus＠therning．org
http://therning.org/magnus identi.ca|twitter: magthe
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