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Commit 1a88f9a4 authored by Simon Peyton Jones's avatar Simon Peyton Jones
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Improve error messages from functional dependencies

Reponding to Trac #9612:

 * Track the CtOrigin of a Derived equality, arising from a
   functional dependency

 * And report it clearly in the error stream

This relies on a previous commit, in which I stop dropping Derived
insolubles on the floor.
parent 8c9d0ce4
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