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-rw-r--r--compiler/parampatterns.nim2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/parampatterns.nim b/compiler/parampatterns.nim
index de7bcaeee..283f83906 100644
--- a/compiler/parampatterns.nim
+++ b/compiler/parampatterns.nim
@@ -50,6 +50,8 @@ proc add(code: var TPatternCode, op: TOpcode) {.inline.} =
 proc whichAlias*(p: PSym): TAliasRequest =
   if p.constraint != nil:
     result = TAliasRequest(p.constraint.strVal[0].ord)
+  else:
+    result = aqNone
 
 proc compileConstraints(p: PNode, result: var TPatternCode) =
   case p.kind