finding an original typedef decl from a reference

[IainS]

consider :

typedef int INT1 ;

int func (INT1 x) ;

----

now if I am in grokparms()  parsing "INT1 x " and I want to issue a  
nice diagnostic for x...

I can't seem to find the right magic that gets me back to that DECL  
for INT1
(I actually want any attributes attached to it and an expand_location)..

any pointers to the correct macro or chain to follow...?

Iain