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Commit efba0546 authored by Simon Peyton Jones's avatar Simon Peyton Jones
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Prioritise equalities when solving, incl deriveds 

We already prioritise equalities when solving, but
Trac #14723 showed that we were not doing so consistently
enough, and as a result the type checker could go into a loop.
Yikes.

See Note [Prioritise equalities] in TcSMonad.

Fixng this bug changed the solve order enough to demonstrate
a problem with fundeps: Trac #14745.
parent 0f43d0db
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