fixes 5870 (#11704)

* fixes #5870
* make tclosure test green again
* this check is correct but breaks some Nimble packages

tests/errmsgs/t5870.nim

@@ -0,0 +1,17 @@
+discard """
+errormsg: "invalid type for const: seq[SomeRefObj]"
+line: 14
+"""
+
+# bug #5870
+type SomeRefObj = ref object of RootObj
+    someIntMember: int
+
+proc createSomeRefObj(v: int): SomeRefObj=
+    result.new()
+    result.someIntMember = v
+
+const compileTimeSeqOfRefObjs = @[createSomeRefObj(100500), createSomeRefObj(2)]
+
+for i in 0..1:
+  echo compileTimeSeqOfRefObjs[i].someIntMember