let! a = 0

if true
   a = 7
end

assert 7 == a

if false
   a = 9
end

assert 7 == a

if true
   a = 0
else
   a = 1
end

assert 0 == a

if false
   a = 0
else
   a = 1
end

assert 1 == a

if true
   a = 1
else if true
   a = 2
else if true
  a = 3
else
  a = 4
end

assert 1 == a

if false
   a = 1
else if true
   a = 2
else if true
  a = 3
else
  a = 4
end

assert 2 == a

if false
   a = 1
else if false
   a = 2
else if true
   a = 3
else
   a = 4
end

assert 3 == a

if false
   a = 1
else if false
   a = 2
else if false
  a = 3
else
  a = 4
end

assert 4 == a

let! b = 54
let! c = 33

if true
  let! b = 18
  c = 7
  assert 18 == b
end

assert 54 == b
assert 7 == c


assert_static_fail if 4 0; end