Diff tutorial Step 0 bla let k = 0 Step 1 bla let x = 0 Step 2 bla let x = 0 let y = 0 Step 3 bla let x = 0 let y = 0 let z = 0 Step 4 bla let x = 0 let y = 0 let z = 0 let a = 0 Step 5 @resetDiff bla let x = 0 let y = 0 let z = 0 let a = 0 let b = 0