Test case for #6163 (#8960)

* Test case for #6163

tests/openarray/t6163.nim

@@ -0,0 +1,17 @@
+discard """
+  exitcode: 0
+  targets: "c cpp js"
+  output: '''19316
+'''
+"""
+
+from future import `->`, `=>`
+from math import `^`, sum
+from sequtils import filter, map, toSeq
+
+proc f: int =
+  toSeq(10..<10_000).filter(a => a == ($a).map(d => (d.ord-'0'.ord).int^4).sum).sum
+
+var a = f()
+
+echo a