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-rw-r--r--compiler/parampatterns.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/parampatterns.nim b/compiler/parampatterns.nim
index be0f995b6..e94068776 100644
--- a/compiler/parampatterns.nim
+++ b/compiler/parampatterns.nim
@@ -216,7 +216,7 @@ proc isAssignable*(owner: PSym, n: PNode): TAssignableResult =
   of nkObjUpConv, nkObjDownConv, nkCheckedFieldExpr: 
     result = isAssignable(owner, n.sons[0])
   else:
-    nil
+    discard
 
 proc matchNodeKinds*(p, n: PNode): bool =
   # matches the parameter constraint 'p' against the concrete AST 'n'.