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Improved unification of record literals in type class resolution
author Adam Chlipala <adam@chlipala.net>
date Sat, 15 Oct 2011 10:19:50 -0400
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type r1 = {A : string, B : string}
type r2 = {B : string, A : string}

val show_r1 : show r1 = mkShow (fn r => r.A ^ "+" ^ r.B)
val show_r2 : show r2 = _