x y : Nat
⊢ x = y
renameI.lean:1:0-1:7: warning: declaration uses `sorry`
x a.b : Nat
⊢ x = a.b
renameI.lean:7:0-7:7: warning: declaration uses `sorry`
x o✝ y a.b : Nat
⊢ x + y = a.b + o✝
renameI.lean:13:0-13:7: warning: declaration uses `sorry`