var a = 12

begin
    a = 32
end

assert_eq (32, a)

# SHADOWING
# =========

var b = 34

begin
    var b = "bim"
    assert_eq ("bim", b)
end

assert_eq(34, b)

# NESTED BLOCKS
# =============
var c = "hello"

begin
    var c = "world"
    begin
        var c = "pizza"
        c = "cat"
        assert_eq ("cat", c)
    end
    assert_eq ("world", c)
end

assert_eq ("hello", c)