list_eq_dec now transparent (wish #2786)
list_eq_dec now transparent (wish #2786)

 The proof is also replaced by a mere "decide equality".
 Patch by Robbert Krebbers.

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@15409 85f007b7-540e-0410-9357-904b9bb8a0f7

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