Enhance handling of parameters in typeclass constraints: permit to specify any typeclass parameter by name anywhere in a typeclass constraint. This allows to share implementations easily and to give any subset of the parameters in any order in the constraints, whereas we are still restricted to a prefix of the typeclass parameters context when using "positional" specifications.
Enhance handling of parameters in typeclass constraints: permit to specify any typeclass parameter by name anywhere in a
typeclass constraint. This allows to share implementations easily and to
give any subset of the parameters in any order in the constraints,
whereas we are still restricted to a prefix of the typeclass parameters
context when using "positional" specifications.


git-svn-id: a49b465eaba45b67e2e1e4e0b2c256a71f59fecb@10736 85f007b7-540e-0410-9357-904b9bb8a0f7

SamB/coq