I noticed this a while ago in ATS2 (just verified in Temptory).

It seems that call-by-reference functions in record definitions cause 
issues with template dispatch.

The following will fail to compile ( no match for `do_something` ) -- 
changing  the signature of `foo.f` to `(int) -> void` will compile 
successfully.


#include "share/HATS/temptory_staload_bucs320.hats"

typedef foo = @{
  f = (&int) -> void
}

extern
fun {a:vtflt} do_something( a ) : void

impltmp
do_something<foo>( x ) =
  let
     var z : int = 0
   in x.f(z)
   end

implfun main0() 
   = println!("Hello [test0]") 
   where {
     var ff : foo = (@{
          f = lam(x) => println!(x)
        }): foo

     val () = do_something<foo>(ff)
   }




I've been using abstract types / casting as a work-around. 

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