Commit 8c77aa2f authored by Robbert Krebbers's avatar Robbert Krebbers

Put the carrier also in the back of canonical structures.

This is inspired by ssr, and makes unification faster if it goes
right-to-left.

See https://sympa.inria.fr/sympa/arc/ssreflect/2013-11/msg00010.html
parent 6615248b
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