fixes #4653

tests/ccgbugs/twrong_rc_for_refarray.nim

@@ -0,0 +1,26 @@
+discard """
+  output: '''m[0][0] = 1.0
+m[0][0] = 2.0'''
+"""
+# bug #4653
+type
+  Vector = ref array[2, float64]
+  Matrix = ref array[2, Vector]
+
+proc newVector(): Vector =
+  new(result)
+
+proc newMatrix(): Matrix =
+  new(result)
+  for ix in 0 .. 1:
+    result[ix] = newVector()
+
+let m = newMatrix()
+
+m[0][0] = 1.0
+echo "m[0][0] = ", m[0][0]
+
+GC_fullCollect()
+
+m[0][0] = 2.0
+echo "m[0][0] = ", m[0][0]