diff --git a/internal/pkg/bifs/base.go b/internal/pkg/bifs/base.go
index 6242d34aba..914edf950a 100644
--- a/internal/pkg/bifs/base.go
+++ b/internal/pkg/bifs/base.go
@@ -141,11 +141,6 @@ func _void(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
 	return mlrval.VOID
 }
 
-// Return 0 (binary)
-func _zero2(input1 *mlrval.Mlrval) *mlrval.Mlrval {
-	return mlrval.FromInt(0)
-}
-
 // Return first argument (binary)
 func _1___(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
 	return input1
diff --git a/internal/pkg/dsl/ast_print.go b/internal/pkg/dsl/ast_print.go
index fc4ec3b0b7..55dfcc78bb 100644
--- a/internal/pkg/dsl/ast_print.go
+++ b/internal/pkg/dsl/ast_print.go
@@ -262,7 +262,6 @@ func (node *ASTNode) Text() string {
 		return tokenText
 	case NodeTypeEprintStatement:
 		return tokenText
-		return tokenText
 	case NodeTypePrintnStatement:
 		return tokenText
 	case NodeTypeEprintnStatement:
diff --git a/internal/pkg/dsl/cst/for.go b/internal/pkg/dsl/cst/for.go
index 3ee5522581..256d6c69be 100644
--- a/internal/pkg/dsl/cst/for.go
+++ b/internal/pkg/dsl/cst/for.go
@@ -580,7 +580,6 @@ func (node *ForLoopMultivariableNode) executeOuter(
 			if blockExitPayload != nil {
 				if blockExitPayload.blockExitStatus == BLOCK_EXIT_BREAK {
 					return blockExitPayload, nil
-					break
 				}
 				// If BLOCK_EXIT_CONTINUE, keep going -- this means the body was exited
 				// early but we keep going at this level
diff --git a/internal/pkg/dsl/cst/leaves.go b/internal/pkg/dsl/cst/leaves.go
index 0063d59248..e8f158b37f 100644
--- a/internal/pkg/dsl/cst/leaves.go
+++ b/internal/pkg/dsl/cst/leaves.go
@@ -25,25 +25,19 @@ func (root *RootNode) BuildLeafNode(
 
 	case dsl.NodeTypeDirectFieldValue:
 		return root.BuildDirectFieldRvalueNode(sval), nil
-		break
 	case dsl.NodeTypeFullSrec:
 		return root.BuildFullSrecRvalueNode(), nil
-		break
 
 	case dsl.NodeTypeDirectOosvarValue:
 		return root.BuildDirectOosvarRvalueNode(sval), nil
-		break
 	case dsl.NodeTypeFullOosvar:
 		return root.BuildFullOosvarRvalueNode(), nil
-		break
 
 	case dsl.NodeTypeLocalVariable:
 		return root.BuildLocalVariableNode(sval), nil
-		break
 
 	case dsl.NodeTypeStringLiteral:
 		return root.BuildStringLiteralNode(sval), nil
-		break
 
 	case dsl.NodeTypeRegex:
 		// During the BNF parse all string literals -- "foo" or "(..)_(...)"
@@ -54,7 +48,6 @@ func (root *RootNode) BuildLeafNode(
 		// handling backslash sequences for regex literals differently from
 		// those for non-regex string literals.
 		return root.BuildRegexLiteralNode(sval), nil
-		break
 
 	case dsl.NodeTypeRegexCaseInsensitive:
 		// StringLiteral nodes like '"abc"' entered by the user come in from
@@ -64,37 +57,27 @@ func (root *RootNode) BuildLeafNode(
 		// (The alternative would be to make a separate Mlrval type separate
 		// from string.)
 		return root.BuildRegexLiteralNode(sval), nil
-		break
 
 	case dsl.NodeTypeIntLiteral:
 		return root.BuildIntLiteralNode(sval), nil
-		break
 	case dsl.NodeTypeFloatLiteral:
 		return root.BuildFloatLiteralNode(sval), nil
-		break
 	case dsl.NodeTypeBoolLiteral:
 		return root.BuildBoolLiteralNode(sval), nil
-		break
 	case dsl.NodeTypeNullLiteral:
 		return root.BuildNullLiteralNode(), nil
-		break
 	case dsl.NodeTypeContextVariable:
 		return root.BuildContextVariableNode(astNode)
-		break
 	case dsl.NodeTypeConstant:
 		return root.BuildConstantNode(astNode)
-		break
 
 	case dsl.NodeTypeArraySliceEmptyLowerIndex:
 		return root.BuildArraySliceEmptyLowerIndexNode(astNode)
-		break
 	case dsl.NodeTypeArraySliceEmptyUpperIndex:
 		return root.BuildArraySliceEmptyUpperIndexNode(astNode)
-		break
 
 	case dsl.NodeTypePanic:
 		return root.BuildPanicNode(astNode)
-		break
 	}
 
 	return nil, fmt.Errorf("at CST BuildLeafNode: unhandled AST node %s", string(astNode.Type))
@@ -401,43 +384,31 @@ func (root *RootNode) BuildContextVariableNode(astNode *dsl.ASTNode) (IEvaluable
 
 	case "FILENAME":
 		return root.BuildFILENAMENode(), nil
-		break
 	case "FILENUM":
 		return root.BuildFILENUMNode(), nil
-		break
 
 	case "NF":
 		return root.BuildNFNode(), nil
-		break
 	case "NR":
 		return root.BuildNRNode(), nil
-		break
 	case "FNR":
 		return root.BuildFNRNode(), nil
-		break
 
 	case "IRS":
 		return root.BuildIRSNode(), nil
-		break
 	case "IFS":
 		return root.BuildIFSNode(), nil
-		break
 	case "IPS":
 		return root.BuildIPSNode(), nil
-		break
 
 	case "ORS":
 		return root.BuildORSNode(), nil
-		break
 	case "OFS":
 		return root.BuildOFSNode(), nil
-		break
 	case "OPS":
 		return root.BuildOPSNode(), nil
-		break
 	case "FLATSEP":
 		return root.BuildFLATSEPNode(), nil
-		break
 
 	}
 
@@ -609,10 +580,8 @@ func (root *RootNode) BuildConstantNode(astNode *dsl.ASTNode) (IEvaluable, error
 
 	case "M_PI":
 		return root.BuildMathPINode(), nil
-		break
 	case "M_E":
 		return root.BuildMathENode(), nil
-		break
 
 	}
 
diff --git a/internal/pkg/dsl/cst/lvalues.go b/internal/pkg/dsl/cst/lvalues.go
index 2e68437227..f6cb181710 100644
--- a/internal/pkg/dsl/cst/lvalues.go
+++ b/internal/pkg/dsl/cst/lvalues.go
@@ -24,56 +24,42 @@ func (root *RootNode) BuildAssignableNode(
 
 	case dsl.NodeTypeDirectFieldValue:
 		return root.BuildDirectFieldValueLvalueNode(astNode)
-		break
 	case dsl.NodeTypeIndirectFieldValue:
 		return root.BuildIndirectFieldValueLvalueNode(astNode)
-		break
 	case dsl.NodeTypePositionalFieldName:
 		return root.BuildPositionalFieldNameLvalueNode(astNode)
-		break
 	case dsl.NodeTypePositionalFieldValue:
 		return root.BuildPositionalFieldValueLvalueNode(astNode)
-		break
 
 	case dsl.NodeTypeFullSrec:
 		return root.BuildFullSrecLvalueNode(astNode)
-		break
 
 	case dsl.NodeTypeDirectOosvarValue:
 		return root.BuildDirectOosvarValueLvalueNode(astNode)
-		break
 	case dsl.NodeTypeIndirectOosvarValue:
 		return root.BuildIndirectOosvarValueLvalueNode(astNode)
-		break
 	case dsl.NodeTypeFullOosvar:
 		return root.BuildFullOosvarLvalueNode(astNode)
-		break
 	case dsl.NodeTypeLocalVariable:
 		return root.BuildLocalVariableLvalueNode(astNode)
-		break
 
 	case dsl.NodeTypeArrayOrMapPositionalNameAccess:
 		return nil, fmt.Errorf(
 			"mlr: '[[...]]' is allowed on assignment left-hand sides only when immediately preceded by '$'.",
 		)
-		break
 	case dsl.NodeTypeArrayOrMapPositionalValueAccess:
 		return nil, fmt.Errorf(
 			"mlr: '[[[...]]]' is allowed on assignment left-hand sides only when immediately preceded by '$'.",
 		)
-		break
 
 	case dsl.NodeTypeArrayOrMapIndexAccess:
 		return root.BuildIndexedLvalueNode(astNode)
-		break
 
 	case dsl.NodeTypeDotOperator:
 		return root.BuildIndexedLvalueNode(astNode)
-		break
 
 	case dsl.NodeTypeEnvironmentVariable:
 		return root.BuildEnvironmentVariableLvalueNode(astNode)
-		break
 	}
 
 	return nil, fmt.Errorf(
diff --git a/internal/pkg/lib/halfpipe.go b/internal/pkg/lib/halfpipe.go
index 57cbcd21e5..ab8eb7f11a 100644
--- a/internal/pkg/lib/halfpipe.go
+++ b/internal/pkg/lib/halfpipe.go
@@ -86,11 +86,3 @@ func OpenInboundHalfPipe(commandString string) (*os.File, error) {
 
 	return readPipe, nil
 }
-
-func waitAndClose(process *os.Process, readPipe *os.File) {
-	_, err := process.Wait()
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "%s: %v\n", "mlr", err)
-	}
-	readPipe.Close()
-}
diff --git a/internal/pkg/mlrval/mlrval_cmp.go b/internal/pkg/mlrval/mlrval_cmp.go
index 7060e5fdef..9585d1b9c5 100644
--- a/internal/pkg/mlrval/mlrval_cmp.go
+++ b/internal/pkg/mlrval/mlrval_cmp.go
@@ -102,12 +102,6 @@ func string_cmp(a, b string) int {
 func cmp_b_ss(input1, input2 *Mlrval) int {
 	return string_cmp(input1.printrep, input2.printrep)
 }
-func cmp_b_xs(input1, input2 *Mlrval) int {
-	return string_cmp(input1.String(), input2.printrep)
-}
-func cmp_b_sx(input1, input2 *Mlrval) int {
-	return string_cmp(input1.printrep, input2.String())
-}
 func cmp_b_ii(input1, input2 *Mlrval) int {
 	return int_cmp(input1.intval, input2.intval)
 }
diff --git a/internal/pkg/mlrval/mlrval_infer.go b/internal/pkg/mlrval/mlrval_infer.go
index d7ac548ced..dfd4c8916e 100644
--- a/internal/pkg/mlrval/mlrval_infer.go
+++ b/internal/pkg/mlrval/mlrval_infer.go
@@ -198,15 +198,6 @@ func inferMaybeFloat(mv *Mlrval) *Mlrval {
 	}
 }
 
-// TODO: comment
-func inferFromBool(mv *Mlrval) *Mlrval {
-	if mv.printrep == "true" {
-		return mv.SetFromPrevalidatedBoolString(mv.printrep, true)
-	} else {
-		return mv.SetFromPrevalidatedBoolString(mv.printrep, false)
-	}
-}
-
 // TODO: comment
 // Shared code for 0o/0b integers
 func inferBaseInt(mv *Mlrval, base int) *Mlrval {
diff --git a/internal/pkg/transformers/bar.go b/internal/pkg/transformers/bar.go
index b1191ff764..f5417988c8 100644
--- a/internal/pkg/transformers/bar.go
+++ b/internal/pkg/transformers/bar.go
@@ -218,14 +218,6 @@ func (tr *TransformerBar) Transform(
 	tr.recordTransformerFunc(inrecAndContext, outputRecordsAndContexts, inputDownstreamDoneChannel, outputDownstreamDoneChannel)
 }
 
-// ----------------------------------------------------------------
-func (tr *TransformerBar) simpleBar(
-	inrecAndContext *types.RecordAndContext,
-	outputRecordsAndContexts *list.List, // list of *types.RecordAndContext
-) {
-	outputRecordsAndContexts.PushBack(inrecAndContext)
-}
-
 // ----------------------------------------------------------------
 func (tr *TransformerBar) processNoAuto(
 	inrecAndContext *types.RecordAndContext,
diff --git a/internal/pkg/transformers/split.go b/internal/pkg/transformers/split.go
index b30a6637cc..fb6578f644 100644
--- a/internal/pkg/transformers/split.go
+++ b/internal/pkg/transformers/split.go
@@ -415,23 +415,3 @@ func (tr *TransformerSplit) makeGroupedOutputFileName(
 	buffer.WriteString(tr.outputFileNameSuffix)
 	return buffer.String()
 }
-
-// makeGroupedIndexedOutputFileName example: "split_yellow_53.csv"
-func (tr *TransformerSplit) makeGroupedIndexedOutputFileName(
-	groupByFieldValues []*mlrval.Mlrval,
-	index int,
-) string {
-	// URL-escape the fields which come from data and which may have '/'
-	// etc within. Don't URL-escape the prefix since people may want to
-	// use prefixes like '/tmp/split' to write to the /tmp directory, etc.
-	var buffer bytes.Buffer
-	buffer.WriteString(tr.outputFileNamePrefix)
-	for _, groupByFieldValue := range groupByFieldValues {
-		buffer.WriteString("_")
-		buffer.WriteString(url.QueryEscape(groupByFieldValue.String()))
-	}
-	buffer.WriteString(fmt.Sprintf("_%d", index))
-	buffer.WriteString(".")
-	buffer.WriteString(tr.outputFileNameSuffix)
-	return buffer.String()
-}
diff --git a/internal/pkg/transformers/utils/join_bucket_keeper.go b/internal/pkg/transformers/utils/join_bucket_keeper.go
index 3d0435d9a7..535479fb68 100644
--- a/internal/pkg/transformers/utils/join_bucket_keeper.go
+++ b/internal/pkg/transformers/utils/join_bucket_keeper.go
@@ -624,44 +624,3 @@ func compareLexically(
 	}
 	return 0
 }
-
-// ================================================================
-func (keeper *JoinBucketKeeper) dump(prefix string) {
-	fmt.Printf("+----------------------------------------------------- %s\n", prefix)
-	fmt.Println("| recordReaderDone     [", keeper.recordReaderDone, "]")
-	fmt.Println("| leof                 [", keeper.leof, "]")
-	fmt.Println("| stateCode            [", keeper.state, "]")
-	fmt.Println("| leftJoinFieldNames   [", strings.Join(keeper.leftJoinFieldNames, ","), "]")
-
-	fmt.Println("| JoinBucket:")
-	// TODO: make utility method
-	leftFieldValuesString := make([]string, len(keeper.JoinBucket.leftFieldValues))
-	for i, leftFieldValue := range keeper.JoinBucket.leftFieldValues {
-		leftFieldValuesString[i] = leftFieldValue.String()
-	}
-	fmt.Printf("|   leftFieldValues    [%s]\n", strings.Join(leftFieldValuesString, ","))
-	fmt.Printf("|   RecordsAndContexts (%d)\n", keeper.JoinBucket.RecordsAndContexts.Len())
-	for element := keeper.JoinBucket.RecordsAndContexts.Front(); element != nil; element = element.Next() {
-		fmt.Println("|    ", element.Value.(*types.RecordAndContext).Record.ToDKVPString())
-	}
-	fmt.Println("|   WasPaired         ", keeper.JoinBucket.WasPaired)
-
-	if keeper.peekRecordAndContext == nil || keeper.peekRecordAndContext.Record == nil {
-		fmt.Println("| peekRecordAndContext [nil]")
-	} else {
-		fmt.Println("| peekRecordAndContext [", keeper.peekRecordAndContext.Record.ToDKVPString(), "]")
-	}
-
-	fmt.Printf("| leftUnpaireds        (%d)\n", keeper.leftUnpaireds.Len())
-	for element := keeper.leftUnpaireds.Front(); element != nil; element = element.Next() {
-		fmt.Println("|   ", element.Value.(*types.RecordAndContext).Record.ToDKVPString())
-	}
-
-	fmt.Printf("------------------------------------------------------\n")
-}
-
-func dumpFieldValues(name string, values []*mlrval.Mlrval) {
-	for i, value := range values {
-		fmt.Printf("-- %s[%d] = %s\n", name, i, value.String())
-	}
-}