Equality: avoid an anomaly about inj_pair2_eq_dec
Equality: avoid an anomaly about inj_pair2_eq_dec

 In coming commits, we'll restrict (try ... with ...), in particular
 to avoid catching anomalies. Currently, an anomaly about inj_pair2_eq_dec
 is raised and catched, let's avoid that by ensuring that Eqdep_dec is
 loaded before entering the critical code.

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@16273 85f007b7-540e-0410-9357-904b9bb8a0f7

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