Nim/tests/fields/timplicitfieldswithpartial.nim

discard """
  output: '''(foo: 38, other: string here)
43'''
"""

type
  Base = ref object of RootObj
  Foo {.partial.} = ref object of Base

proc my(f: Foo) =
  #var f.next = f
  let f.foo = 38
  let f.other = "string here"
  echo f[]
  echo f.foo + 5

var g: Foo
new(g)
my(g)