Behaviour of alias this changed

[kenji hara]

2012/5/9 H. S. Teoh <hsteoh at quickfur.ath.cx>:
> I have some code along these lines:
>
>        struct S {
>                short[4] data;
>                alias this data;
>
>                string toString() { ... }
>        }
>        ...
>        S s;
>        writeln(to!string(s));
>
> In dmd 2.059 (I believe) and earlier, this calls S.toString(). However,
> in git dmd, this calls data.toString() instead.

This is a Phobos regression in git head (and maybe in 2.059).
Please file this in bugzilla.

Kenji Hara

----
import std.traits;

struct S {
    short[4] data;
    alias data this;
    string toString() { return "<S>"; }
}
void main()
{
    S s;
    static assert(isStaticArray!S); // succeeds in 2.059, failed in
2.058 and earlier
    toImpl!string(s);  // matches to static array version
}

extern(C) int printf(const char*, ...);
void toImpl(T, S)(S s)
    if (is(S == struct) && is(typeof(&S.init.toString)) &&
        isSomeString!T)
{
    printf("1:\n");
}
void toImpl(T, S)(ref S s)
    if (isStaticArray!S)
{
    printf("2:\n");
}