fixes #3230

compiler/semfold.nim

@@ -435,7 +435,7 @@ proc evalOp(m: TMagic, n, a, b, c: PNode): PNode =
      mAppendStrStr, mAppendSeqElem, mSetLengthStr, mSetLengthSeq,
      mParseExprToAst, mParseStmtToAst, mExpandToAst, mTypeTrait, mDotDot,
      mNLen..mNError, mEqRef, mSlurp, mStaticExec, mNGenSym, mSpawn,
-     mParallel, mPlugin, mGetTypeInfo:
+     mParallel, mPlugin, mGetTypeInfo, mTypeOf:
     discard
   of mEqProc:
     result = newIntNodeT(ord(

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