Agda-2.3.2.2: test/interaction/Issue606.agda
module Issue606 where
infixr 1 _,_
record _×_ (A B : Set) : Set where
constructor _,_
field fst : A
snd : B
postulate A B C : Set
test : A × (B × C)
test = {!!} , {!!}
-- refining the second hole should give "? , ?" (no enclosing parens!)