`if` as a statement breaks return values in functions

[sylvrs]

Overview

The following snippet below should produce the value 3 but instead produces the value 1

// Recursively calculates the fibonacci sequence
fn fibonacci(n: number) {
    @dump_stack();
    if (n <= 1) {
        return n;
    }
    return fibonacci(n - 1) + fibonacci(n - 2);
}

@println(fibonacci(4));

I suspect this is a result of how we handle return values relative to our frame pointer but more investigation is needed.

[sylvrs]

The following code outputs the expected result of the Fibonacci sequence:

fn fibonacci(n: number) {
    return if (n <= 1) n else (fibonacci(n - 1) + fibonacci(n - 2));
}

let results = [];
for (0..10) |n| {
    results[n] = fibonacci(n);
}
@println("Results: ", @join(results, ", "));

Output:

Results: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34