Wanted: warning option for usages of unary minus
john at repetae.net
Mon May 21 21:21:31 EDT 2007
On Mon, May 21, 2007 at 10:33:56AM +0100, Simon Marlow wrote:
> I think that we could easily remove the '3e4' lexical syntax though, since
> '3*10^^4' works just as well (I often write the latter anyway) (and guess
> what, I just had to look up the difference between ^ and ^^, only to
> discover I picked the wrong one). The '3e4' syntax is a common source of
> compiler bugs, becuase it is rarely used and hence rarely tested.
but they have substantially different translations.
3e2 -> fromRational (300 % 1)
(fromInteger 3) * (fromInteger 10) ^^ (2 :: Foo)
where Foo is whatever 4 defaults to, probably Integer, but could be a
compile error if defaulting is off or changed.
Though, the current floating point support in haskell is pretty funky as
John Meacham - ⑆repetae.net⑆john⑈
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