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-rw-r--r--compiler/types.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/types.nim b/compiler/types.nim
index bcd472d06..10ff1d09d 100644
--- a/compiler/types.nim
+++ b/compiler/types.nim
@@ -73,7 +73,7 @@ const
                tyInferred, tySink, tyLent, tyOwned}
   # typedescX is used if we're sure tyTypeDesc should be included (or skipped)
   typedescPtrs* = abstractPtrs + {tyTypeDesc}
-  typedescInst* = abstractInst + {tyTypeDesc, tyOwned}
+  typedescInst* = abstractInst + {tyTypeDesc, tyOwned, tyUserTypeClass}
 
 proc invalidGenericInst*(f: PType): bool =
   result = f.kind == tyGenericInst and lastSon(f) == nil