nll: correctly deal with bivariance fixes #104409 when in a bivariant context, relating stuff should always trivially succeed. Also changes the mir validator to correctly deal with higher ranked regions. r? types cc ``@RalfJung``
nll: correctly deal with bivariance fixes #104409 when in a bivariant context, relating stuff should always trivially succeed. Also changes the mir validator to correctly deal with higher ranked regions. r? types cc ``@RalfJung``