At: decls mng rename member 1 1 1 1 1 1
1. ds1: Collection(dec())
2. ds2: Collection(dec())
3. x: Label
4. y: Label
5. rho: Decl
6. v: 
d:{d:dec()| d 
ds1 }. [[d]] rho(x)
7. 
d:dec(). d ds2 
d.lbl = y mk_dec(x, d.typ) ds1
8. d: dec()
9. d ds2
10. d.lbl =
y
mk_dec(x, d.typ) ds1
By: BackThruSomeHyp
Generated subgoal:| 1 | d.lbl = y |
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