fixes #4555

tests/lookups/test.nim

@@ -0,0 +1,17 @@
+# This file needs to be called 'test' nim to provoke a clash
+# with the unittest.test name. Issue #
+
+import unittest, macros
+
+# bug #4555
+
+macro memo(n: untyped): typed =
+  result = n
+
+proc fastFib(n: int): int {.memo.} = 40
+proc fib(n: int): int = 40
+
+suite "memoization":
+  test "recursive function memoization":
+    check fastFib(40) == fib(40)
+