type
  Foo = object
    a: int
    b: int

proc foo(): Foo =
  (result.a, result.b) = (7, 8, 9, 10)

echo foo()
# that works on Nim 2.0.0 and older, but on devel there's a compile-time error:
Error: tuple with 2 elements expected, but got '(int, int, int, int)' with 4
elements
# Does that seem like a bug that needs to be reported or a known change that's
# coming?