Clearer error messages - how?

[Simen Kjaeraas]

I'm playing around with templates and mixins of different types, in an  
effort to
make a property struct with all manners of overloaded operators (as per
Alternative solutions to returning ref types. in digitalmars.D).

Now, when I use this thing and do something wrong, I get error messages  
with
very user-unfriendly texts. For instance:

/////////////////

int _a;
property!(int, properties.read) a = &_a; // properties.read means only  
operators
                                   // that do not change the data are  
overloaded.
a += 4; // this lines leads to the errors below

/////////////////

test.d(8): Error: 'a' is not a scalar, it is a
   _property!(int,void,"+,-,*,/,%,&,|,^,<<,>>,>>>,~,in","+,-","")
test.d(8): Error: incompatible types for ((a) += (4)):
   '_property!(int,void,"+,-,*,/,%,&,|,^,<<,>>,>>>,~,in","+,-","")' and  
'int'
test.d(8): Error: 'a' is not of arithmetic type, it is a
   _property!(int,void,"+,-,*,/,%,&,|,^,<<,>>,>>>,~,in","+,-","")


As you can see, hardly user-friendly. Now, how can I make them more  
readable? Do
I need to overload all the other operators with templated functions with  
static
asserts?

-- Simen