690.lean:3:2-3:29: error: too many variable names provided at alternative 'step', #3 provided, but #2 expected
case step
a b m✝ : Nat
hStep : a.le m✝
ih : a.le (m✝ + 1)
⊢ a.le (m✝.succ + 1)
690.lean:6:0-6:7: warning: declaration uses 'sorry'
case step
a b x : Nat
hStep : a.le x
ih : a.le (x + 1)
⊢ a.le (x.succ + 1)
690.lean:11:0-11:7: warning: declaration uses 'sorry'