Fix #14270 and add testcases (#14276)

tests/arc/trepr.nim

@@ -3,6 +3,12 @@ discard """
   nimout: '''(a: true, n: doAssert)
 Table[system.string, trepr.MyType](data: @[], counter: 0)
 nil
+'''
+  output: '''
+nil
+2
+Obj(member: ref @[hello])
+ref (member: ref @[hello])
 '''
 """
 import tables
@@ -32,3 +38,27 @@ macro dumpSym(a: typed) =
 
 dumpSym(doAssert)
 
+# bug 13731
+
+import os
+var a: File
+echo repr a
+
+# bug 13872
+
+echo repr(2'u16)
+
+# bug 14270
+
+type
+  Obj = ref object
+    member: ref seq[string]
+
+var c = Obj(member: new seq[string])
+c.member[] = @["hello"]
+echo c.repr
+
+var c2 = new tuple[member: ref seq[string]]
+c2.member = new seq[string]
+c2.member[] = @["hello"]
+echo c2.repr