PhobosWatch: manifest => enum

[Walter Bright]

Sean Kelly wrote:
> The weird thing for me is that this will allow individual enums of any 
> type but grouped enums of only numeric types.

The following will work:

enum
{
     x = 3,   // x is int
     y = 4L,  // y is long
}

The idea is that for anonymous enums, there is no type for the 
enumeration as a whole. Therefore, each member of the enumeration can 
have a different type.