fixes #3230

tests/typerel/typeof_in_template.nim

@@ -0,0 +1,16 @@
+discard """
+  output: '''@[a, c]'''
+"""
+
+# bug #3230
+
+import sequtils
+
+const
+  test_strings = ["a", "b", "c"]
+
+proc is_doc(x: string): bool = x == "b"
+
+let
+  tests = @test_strings.filter_it(not it.is_doc)
+echo tests