// Test const variable declarations
const var x = 5
assert_equal(5, x)

// Test that const variables cannot be reassigned
assert_throws("Error: \"Error, cannot assign to constant value.\"", fun() { const var y = 10; y = 20 })

// Test const with auto keyword
const auto z = "hello"
assert_equal("hello", z)

// Test that const auto variables cannot be reassigned
assert_throws("Error: \"Error, cannot assign to constant value.\"", fun() { const auto w = 3; w = 4 })

// Test is_var_const on const var
const var c = 42
assert_true(c.is_var_const())

// Test that non-const var is not const
var nc = 42
assert_false(nc.is_var_const())