Bug w/tuple of custom types?

[Jonathan M Davis]

> Sample program:
> 
> import std.typecons;
> 
> typedef uint oid_t;
> 
> void main() {
>     Tuple!(uint,uint) key;
>     // Tuple!(oid_t,oid_t) key; // Doesn't work
> }
> 
> If I use the last tuple instead of the first, I get the following
> compiler error with DMD 2.052 in OS X:
> 
> /path/to/src/phobos/std/format.d(1579): Error: function
> std.format.formatValue!(Appender!(string),oid_t,immutable(char)).formatValu
> e is deprecated
> /path/to/src/phobos/std/format.d(306): Error: template instance
> std.format.formatGeneric!(Appender!(string),oid_t,immutable(char))
> error instantiating
> /path/to/src/phobos/std/typecons.d(507):        instantiated from here:
> formattedWrite!(Appender!(string),immutable(char),oid_t)
> 
> It seems that std.typecons is using a deprecated formatting API, which
> is triggered by my use of a custom type? And ... I guess this would be
> a bug? (I looked in the tracker, and couldn't find it there already.)

I would point out that typedef is going to be removed from the language. You 
should be using alias instead. I don't know if this wil lhave any effect on 
the bug you're seeing though (probably, since alias doesn't actually produce a 
new type - just an alias for the old one).

- Jonathan M Davis