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-rw-r--r--compiler/jsgen.nim3
1 files changed, 2 insertions, 1 deletions
diff --git a/compiler/jsgen.nim b/compiler/jsgen.nim
index 39009bd2f..bbc64a2f0 100644
--- a/compiler/jsgen.nim
+++ b/compiler/jsgen.nim
@@ -2272,6 +2272,7 @@ proc genObjConstr(p: PProc, n: PNode, r: var TCompRes) =
   r.kind = resExpr
   var initList : Rope
   var fieldIDs = initIntSet()
+  let nTyp = n.typ.skipTypes(abstractInst)
   for i in 1..<n.len:
     if i > 1: initList.add(", ")
     var it = n[i]
@@ -2280,7 +2281,7 @@ proc genObjConstr(p: PProc, n: PNode, r: var TCompRes) =
     gen(p, val, a)
     var f = it[0].sym
     if f.loc.r == nil: f.loc.r = mangleName(p.module, f)
-    fieldIDs.incl(lookupFieldAgain(n.typ, f).id)
+    fieldIDs.incl(lookupFieldAgain(nTyp, f).id)
 
     let typ = val.typ.skipTypes(abstractInst)
     if a.typ == etyBaseIndex: