Error deducing function

[Ignacious via Digitalmars-d]

It would be EXTREMELY helpful if dmd would give a better result 
than

main.d(30): Error: template main.Do cannot deduce function from 
argument types !(1, string, int)(2, "adf"), candidates are:
main.d(6):        main.Do(int x, string y, alias Q)(int z, string 
q)

Like, which arguments actually pass and which ones fail, etc.

I know we are all suppose to be geniuses here but I flunked out 
of that class. Seems like the compiler knows where the error is 
so why can't it inform me a bit better than basically telling me 
there is an error and which lines it occurred on(cause that is 
all it really does in practice).