closes #6249

tests/concepts/t976.nim

@@ -1,3 +1,7 @@
+discard """
+  output: '''Printable'''
+"""
+
 import macros
 
 type
@@ -30,3 +34,21 @@ template reject(e) =
 reject take[string](i2)
 reject take[int1](i2)
 
+# bug #6249
+type
+    Obj1[T] = object
+        v: T
+
+    Obj2 = ref object
+
+    PrintAble = concept x
+        $x is string
+
+converter toObj1[T](t: T): Obj1[T] =
+    return Obj1[T](v: t)
+
+proc `$`[T](nt: Obj1[T]): string =
+    when T is PrintAble: result = "Printable"
+    else: result = "Non Printable"
+
+echo Obj2()