// Test var declaration and scoping

// Test 1: var prevents shadowing
print("=== Test 1: var prevents shadowing ===")
x = 10
function test1()
  var x = 0
  x = x + 1
end
test1()
print("x after test1:", x)  // Should be 10 (unchanged)

// Test 2: without var, modifies outer scope
print("\n=== Test 2: without var, modifies outer ===")
y = 20
function test2()
  y = y + 5
end
test2()
print("y after test2:", y)  // Should be 25

// Test 3: var creates local when no outer exists
print("\n=== Test 3: var with no outer existing ===")
function test3()
  var z = 100
  print("z inside function:", z)
end
test3()
print("z not accessible outside (skipping to avoid error)")

// Test 4: Closures now work!
print("\n=== Test 4: Closures work ===")
function makeCounter()
  var count = 0
  function increment()
    count = count + 1
    return count
  end
  return increment
end
c = makeCounter()
print("First call:", c())    // Should be 1
print("Second call:", c())   // Should be 2
print("Third call:", c())    // Should be 3

// Test 5: Block scope leakage (if blocks can leak)
print("\n=== Test 5: Block scope behavior ===")
if true then
  block_var = "hello"
end
print("block_var outside if:", block_var)  // Should work, leaks out