Philippa Cowderoy wrote:
> On Wed, 1 Aug 2007, Simon Marlow wrote:
>
>> I'm rather attached to the convention I use, which is
>>
>> - CamelCase for exported identifiers
>> - underscores otherwise
> <snip>
>> Yes I'm aware that a single-word identifier is the same in both conventions;
>> it's not perfect.
>>
>
> How about _nonexportedIdentifier or something similar?
>
Leading underscores are used in pattern matches to indicate to GHC that unused
names like '_foo' should not cause a warning to be printed. Otherwise the
warning is turned off by using just '_' but that erases the readability of
using an actual name.
Thus:
take _ [] = [] -- no warning
take n [] = [] -- warning that n is unused
take _n [] = [] -- no warning
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