-fwarn-redundant-constraints should not be part of -Wall
When I compile existing code with GHC-7.11.20150707 I get lot of "redundant constraints" warnings. Generally I think that this warning can be very useful for minimizing constraints, nonetheless there are good reasons not choose minimal constraints for a type signature.
E.g. if I have to implement
Data.Map.singleton I do not need the
Ord k constraint for the key type. However, I might add it anyway in order to be able to change the implementation in future such that it uses
Ord k dictionary.
Thus I suggest to exclude
|Component||Compiler (Type checker)|