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Add a weakening lemma for goals: "is_Some (<[i:=x]>m !! j)"

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Closed Armaël Guéneau requested to merge Armael/stdpp:is_Some_lookup_weaken into master Feb 26, 2020
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I found this lemma to be quite useful in situations where one just wants to eliminate an insert that only updates a value that we know was already in the map.

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Source branch: is_Some_lookup_weaken