Nim/tests/typerel/t7600_1.nim

discard """
errormsg: "type mismatch: got <Thin[system.int]>"
nimout: '''t7600_1.nim(18, 6) Error: type mismatch: got <Thin[system.int]>
but expected one of:
proc test[T](x: Paper[T])

expression: test tn'''
"""

type
  Paper[T] = ref object of RootObj
    thickness: T
  Thin[T]  = object of Paper[T]

proc test[T](x: Paper[T]) = discard

var tn = Thin[int]()
test tn