At: decls mng member 1 1 1 2 1
1. ds1: Collection(dec())
2. ds2: Collection(dec())
3. x: Label
4. rho: Decl
5. v: 
d:{d:dec()| d 
ds1 }. [[d]] rho(x)
6. 
d:dec(). d ds2 
d.lbl = x d ds1
7. lbl: Label
8. d1: SimpleType
9. < lbl,d1 > ds2
10. 
lbl =
x
v if x = lbl
[[d1]] rho else Top fi
By: SplitOnConclITE
Generated subgoal:| 1 | 11. x = lbl
v [[d1]] rho |
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