x y : Nat
⊢ x = y
renameI.lean:5:2-5:7: warning: declaration uses 'sorry'
x a.b : Nat
⊢ x = a.b
renameI.lean:11:2-11:7: warning: declaration uses 'sorry'
x o✝ y a.b : Nat
⊢ x + y = a.b + o✝
renameI.lean:17:2-17:7: warning: declaration uses 'sorry'