Re: [Haskell-cafe] negate and -

On Thu, 17 May 2007 13:50:15 -0300 Maurí­cio wrote:

Hi,

Haskell language reference says the special - operator translates to negate. However, this:

(+ negate 5) 5

Function application binds tightest, so this is equivalent to: (+ (negate 5)) 5

works but this:

(+ -5) 5

In this context, it's trying to parse - as the binary subtraction operator. The special treatment of - in its unary context is that (-5) is (negate 5) and not the section ((-) 5)

is not valid. Why?

Thanks, Maurício

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