fixes #2286

tests/parallel/tconvexhull.nim

@@ -6,7 +6,7 @@ true
 true
 true'''
 
-ccodeCheck: "!'deepcopy('"
+ccodeCheck: "\\i ! @'deepCopy(' .*"
 """
 
 # parallel convex hull for Nim bigbreak

tests/parallel/tmissing_deepcopy.nim

@@ -0,0 +1,40 @@
+discard """
+  ccodeCheck: "\\i @'deepCopy(' .*"
+"""
+
+# bug #2286
+
+import threadPool
+
+type
+  Person = ref object
+    name: string
+    friend: Person
+
+var
+  people: seq[Person] = @[]
+
+proc newPerson(name:string): Person =
+  result.new()
+  result.name = name
+
+proc greet(p:Person) =
+  p.friend.name &= "-MUT" # this line crashes the program
+  echo "Person {",
+    " name:", p.name, "(", cast[int](addr p.name),"),",
+    " friend:", p.friend.name, "(", cast[int](addr p.friend.name),") }"
+
+proc setup =
+  for i in 0 .. <20:
+    people.add newPerson("Person" & $(i + 1))
+  for i in 0 .. <20:
+    people[i].friend = people[19-i]
+
+proc update =
+  parallel:
+    for i in 0 .. people.high:
+      spawn people[i].greet()
+
+when isMainModule:
+  setup()
+  update()