const->immutable array argument?

[Daniel Murphy]

"Steven Schveighoffer" <schveiguy at yahoo.com> wrote in message 
news:op.v13w8td2eav7ka at localhost.localdomain...
> On Tue, 20 Sep 2011 07:33:20 -0400, bearophile <bearophileHUGS at lycos.com> 
> wrote:
>
>> void foo(const ref int[5] a) {}
>> void main() {
>>     immutable int[5] arr;
>>     foo(arr); // Error?
>> }
>
> The complaint from the compiler is that cast(const(int[5u])) arr is not an 
> lvalue.

It's a bug, the compiler shouldn't be inserting a cast when the value 
implicitly converts.  It's also a bug when the compiler tries to optimise 
away the variable to a literal when passing by reference, I've got a patch 
for this I haven't written up yet.