Return nan?

Help
1

I can’t seem to return “nan” can anyone help me please.

pub fn eval(e: *const Expr) f128 {
    return switch (e.*) {
        Expr.Val => |v| v,
        Expr.Add => |a| eval(a.left) + eval(a.right),
        Expr.Sub => |s| eval(s.left) - eval(s.right),
        Expr.Mul => |m| eval(m.left) * eval(m.right),
        Expr.Div => |d| {
            const right_val = eval(d.right);
            if (right_val == 0) {
                // Gérer la division par zéro
                return std.math.nan;
            }
            return eval(d.left) / right_val;
        },
    };
}
2 
return std.math.nan(f128);
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