No LANGUAGE option for # in symbols

[neil]

The LANGUAGE pragma is the new recommended way of saying which features you want (I think), but there is no value that corresponds to allowing # in symbols (i.e. unsafeCoerce#) - meaning OPTIONS_GHC has to be used in this case.

[malcolm.wallace@…]

Of course, for unsafeCoerce# in particular, you can now use the standard name without a #, by importing from Unsafe.Coerce. But in general, if you want to write unboxed values in the Glasgow Haskell language, it would indeed be good to have a pragma to describe it. How about LANGUAGE Unboxed?

[igloo]

I think something like MagicHash? would be a better name than Unboxed, as the actual extension is that # can count as either a letter or a symbol. Who's meant to decide these things?

[igloo]

MagicHash extension now added to Cabal and GHC HEAD.