[Haskell-cafe] (Num t) => [t] or [Int]
Brandon S. Allbery KF8NH
allbery at ece.cmu.edu
Fri May 9 18:08:58 EDT 2008
On 2008 May 9, at 17:07, PR Stanley wrote:
> I thought [1, 2, 3] :: [Int]
> GHC says it's (Num t) > [t]
> Okay, when it comes to 3.3:[1,2,3] (Num t) => [t] makes more sense.
> Is that the only reason?
The Haskell 98 standard says that numeric literals are of type Num t
=> t (so you don't need to fromIntegral everything that looks like an
Int but is used with e.g. Doubles). Therefore a list of them is Num t
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university KF8NH
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