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-rw-r--r--compiler/aliases.nim18
1 files changed, 11 insertions, 7 deletions
diff --git a/compiler/aliases.nim b/compiler/aliases.nim
index fa9824c41..fa1167753 100644
--- a/compiler/aliases.nim
+++ b/compiler/aliases.nim
@@ -10,7 +10,9 @@
 ## Simple alias analysis for the HLO and the code generators.
 
 import
-  ast, astalgo, types, trees, intsets
+  ast, astalgo, types, trees
+
+import std/intsets
 
 when defined(nimPreviewSlimSystem):
   import std/assertions
@@ -49,14 +51,16 @@ proc isPartOfAux(a, b: PType, marker: var IntSet): TAnalysisResult =
   if compareTypes(a, b, dcEqIgnoreDistinct): return arYes
   case a.kind
   of tyObject:
-    if a[0] != nil:
-      result = isPartOfAux(a[0].skipTypes(skipPtrs), b, marker)
+    if a.baseClass != nil:
+      result = isPartOfAux(a.baseClass.skipTypes(skipPtrs), b, marker)
     if result == arNo: result = isPartOfAux(a.n, b, marker)
   of tyGenericInst, tyDistinct, tyAlias, tySink:
-    result = isPartOfAux(lastSon(a), b, marker)
-  of tyArray, tySet, tyTuple:
-    for i in 0..<a.len:
-      result = isPartOfAux(a[i], b, marker)
+    result = isPartOfAux(skipModifier(a), b, marker)
+  of tySet, tyArray:
+    result = isPartOfAux(a.elementType, b, marker)
+  of tyTuple:
+    for aa in a.kids:
+      result = isPartOfAux(aa, b, marker)
       if result == arYes: return
   else: discard