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This was a simple slip, that gave rise to the bug reported in comment:13 of Trac #14045. We were supplying roles to mkAlgTyCon that didn't match the tyvars.
d74983ef
This was a simple slip, that gave rise to the bug reported in comment:13 of Trac #14045. We were supplying roles to mkAlgTyCon that didn't match the tyvars.