Add new notation for negative numbers when using {-# LANGUAGE NegativeLiterals #-}

I propose that when using {-# LANGUAGE NegativeLiterals #-} ghc should also read ~123 as a negative literal. SML uses ~ as the unary minus, so it's not completely out of the blue. The reason would be to minimize ambiguity.

Edited Mar 10, 2019 by bg_

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Add new notation for negative numbers when using {-# LANGUAGE NegativeLiterals #-}