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Commit 66658eed authored by Simon Peyton Jones's avatar Simon Peyton Jones
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compiler/stranal/WwLib.lhs
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...@@ -528,7 +528,8 @@ can still be specialised by the type-class specialiser, something like ...@@ -528,7 +528,8 @@ can still be specialised by the type-class specialiser, something like
BUT if f is strict in the Ord dictionary, we might unpack it, to get BUT if f is strict in the Ord dictionary, we might unpack it, to get
fw :: (a->a->Bool) -> [a] -> Int# -> a fw :: (a->a->Bool) -> [a] -> Int# -> a
and the type-class specialiser can't specialise that. and the type-class specialiser can't specialise that. An example is
Trac #6056.
Moreover, dictinoaries can have a lot of fields, so unpacking them can Moreover, dictinoaries can have a lot of fields, so unpacking them can
increase closure sizes. increase closure sizes.
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