fixes #2637

tests/ccgbugs/twrong_discriminant_check.nim

@@ -0,0 +1,30 @@
+discard """
+  output: "(kind: None)"
+"""
+
+when true:
+  # bug #2637
+
+  type
+    OptionKind = enum
+      None,
+      Some
+
+    Option*[T] = object
+      case kind: OptionKind
+      of None:
+        discard
+      of Some:
+        value*: T
+
+  proc none*[T](): Option[T] =
+    Option[T](kind: None)
+
+  proc none*(T: typedesc): Option[T] = none[T]()
+
+
+  proc test(): Option[int] =
+    int.none
+
+  echo test()
+