At: sigma decls mng functionality 1 1 1 1
1. d1: Collection(dec())
2. d2: Collection(dec())
3. rho: Decl
4. l: Label
5. u1: [[d1]] rho(l)
6. d1 = d2
7. x: SimpleType
8. x 
dec_lookup(d1;l)
mk_dec(l, x) d1
By: RWO "member_dec_lookup" -1
Generated subgoals:None
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