diff --git a/lang/funcs/contains_polyfunc.go b/lang/funcs/contains_polyfunc.go
index c61e2455..1c0f74c8 100644
--- a/lang/funcs/contains_polyfunc.go
+++ b/lang/funcs/contains_polyfunc.go
@@ -30,6 +30,10 @@ const (
 	// starts with an underscore so that it cannot be used from the lexer.
 	// XXX: change to _contains and add syntax in the lexer/parser
 	ContainsFuncName = "contains"
+
+	// arg names...
+	containsArgNameNeedle   = "needle"
+	containsArgNameHaystack = "haystack"
 )
 
 func init() {
@@ -56,7 +60,7 @@ func (obj *ContainsPolyFunc) String() string {
 
 // ArgGen returns the Nth arg name for this function.
 func (obj *ContainsPolyFunc) ArgGen(index int) (string, error) {
-	seq := []string{"needle", "haystack"}
+	seq := []string{containsArgNameNeedle, containsArgNameHaystack}
 	if l := len(seq); index >= l {
 		return "", fmt.Errorf("index %d exceeds arg length of %d", index, l)
 	}
@@ -379,8 +383,8 @@ func (obj *ContainsPolyFunc) Stream() error {
 			}
 			obj.last = input // store for next
 
-			needle := input.Struct()["needle"]
-			haystack := (input.Struct()["haystack"]).(*types.ListValue)
+			needle := input.Struct()[containsArgNameNeedle]
+			haystack := (input.Struct()[containsArgNameHaystack]).(*types.ListValue)
 
 			_, exists := haystack.Contains(needle)
 			var result types.Value = &types.BoolValue{V: exists}
diff --git a/lang/funcs/core/fmt/printf_func.go b/lang/funcs/core/fmt/printf_func.go
index 362f3936..fb615280 100644
--- a/lang/funcs/core/fmt/printf_func.go
+++ b/lang/funcs/core/fmt/printf_func.go
@@ -32,7 +32,7 @@ const (
 	// FIXME: should this be named sprintf instead?
 	PrintfFuncName = "printf"
 
-	formatArgName = "format" // name of the first arg
+	printfArgNameFormat = "format" // name of the first arg
 )
 
 func init() {
@@ -68,10 +68,10 @@ func (obj *PrintfFunc) String() string {
 // ArgGen returns the Nth arg name for this function.
 func (obj *PrintfFunc) ArgGen(index int) (string, error) {
 	if index == 0 {
-		return formatArgName, nil
+		return printfArgNameFormat, nil
 	}
 	// TODO: if index is big enough that it would return the string in
-	// `formatArgName` then we should return an error! (Nearly impossible.)
+	// `printfArgNameFormat` then we should return an error! (Nearly impossible.)
 	return util.NumToAlpha(index - 1), nil
 }
 
@@ -186,7 +186,7 @@ func (obj *PrintfFunc) Unify(expr interfaces.Expr) ([]interfaces.Invariant, erro
 				if err != nil {
 					return nil, err
 				}
-				if argName == formatArgName {
+				if argName == printfArgNameFormat {
 					return nil, fmt.Errorf("could not build function with %d args", i+1) // +1 for format arg
 				}
 
@@ -290,12 +290,12 @@ func (obj *PrintfFunc) Polymorphisms(partialType *types.Type, partialValues []ty
 		Out:  types.TypeStr,
 	}
 	// add first arg
-	typ.Map[formatArgName] = types.TypeStr
-	typ.Ord = append(typ.Ord, formatArgName)
+	typ.Map[printfArgNameFormat] = types.TypeStr
+	typ.Ord = append(typ.Ord, printfArgNameFormat)
 
 	for i, x := range typList {
 		name := util.NumToAlpha(i) // start with a...
-		if name == formatArgName {
+		if name == printfArgNameFormat {
 			return nil, fmt.Errorf("could not build function with %d args", i+1) // +1 for format arg
 		}
 
@@ -389,10 +389,10 @@ func (obj *PrintfFunc) Stream() error {
 			}
 			obj.last = input // store for next
 
-			format := input.Struct()[formatArgName].Str()
+			format := input.Struct()[printfArgNameFormat].Str()
 			values := []types.Value{}
 			for _, name := range obj.Type.Ord {
-				if name == formatArgName { // skip format arg
+				if name == printfArgNameFormat { // skip format arg
 					continue
 				}
 				x := input.Struct()[name]
diff --git a/lang/funcs/core/template_func.go b/lang/funcs/core/template_func.go
index 9e01f7c4..fc47e2cc 100644
--- a/lang/funcs/core/template_func.go
+++ b/lang/funcs/core/template_func.go
@@ -39,8 +39,9 @@ const (
 	// library.
 	TemplateName = "template"
 
-	argNameTemplate = "template"
-	argNameVars     = "vars"
+	// arg names...
+	templateArgNameTemplate = "template"
+	templateArgNameVars     = "vars"
 )
 
 var (
@@ -84,7 +85,7 @@ func (obj *TemplateFunc) String() string {
 
 // ArgGen returns the Nth arg name for this function.
 func (obj *TemplateFunc) ArgGen(index int) (string, error) {
-	seq := []string{argNameTemplate, argNameVars}
+	seq := []string{templateArgNameTemplate, templateArgNameVars}
 	if l := len(seq); index >= l {
 		return "", fmt.Errorf("index %d exceeds arg length of %d", index, l)
 	}
@@ -184,7 +185,7 @@ func (obj *TemplateFunc) Unify(expr interfaces.Expr) ([]interfaces.Invariant, er
 				if err != nil {
 					return nil, err
 				}
-				if argName == argNameTemplate {
+				if argName == templateArgNameTemplate {
 					return nil, fmt.Errorf("could not build function with %d args", 1)
 				}
 
@@ -259,7 +260,7 @@ func (obj *TemplateFunc) Unify(expr interfaces.Expr) ([]interfaces.Invariant, er
 // XXX: is there a better API than returning a buried `variant` type?
 func (obj *TemplateFunc) Polymorphisms(partialType *types.Type, partialValues []types.Value) ([]*types.Type, error) {
 	// TODO: return `variant` as second arg for now -- maybe there's a better way?
-	str := fmt.Sprintf("func(%s str, %s variant) str", argNameTemplate, argNameVars)
+	str := fmt.Sprintf("func(%s str, %s variant) str", templateArgNameTemplate, templateArgNameVars)
 	variant := []*types.Type{types.NewType(str)}
 
 	if partialType == nil {
@@ -281,11 +282,11 @@ func (obj *TemplateFunc) Polymorphisms(partialType *types.Type, partialValues []
 			}
 		}
 		if len(ord) == 1 { // no args being passed in (boring template)
-			return []*types.Type{types.NewType(fmt.Sprintf("func(%s str) str", argNameTemplate))}, nil
+			return []*types.Type{types.NewType(fmt.Sprintf("func(%s str) str", templateArgNameTemplate))}, nil
 
 		} else if t, exists := partialType.Map[ord[1]]; exists && t != nil {
 			// known vars type! w00t!
-			return []*types.Type{types.NewType(fmt.Sprintf("func(%s str, %s %s) str", argNameTemplate, argNameVars, t.String()))}, nil
+			return []*types.Type{types.NewType(fmt.Sprintf("func(%s str, %s %s) str", templateArgNameTemplate, templateArgNameVars, t.String()))}, nil
 		}
 	}
 
@@ -348,11 +349,11 @@ func (obj *TemplateFunc) Validate() error {
 func (obj *TemplateFunc) Info() *interfaces.Info {
 	var sig *types.Type
 	if obj.NoVars {
-		str := fmt.Sprintf("func(%s str) str", argNameTemplate)
+		str := fmt.Sprintf("func(%s str) str", templateArgNameTemplate)
 		sig = types.NewType(str)
 
 	} else if obj.Type != nil { // don't panic if called speculatively
-		str := fmt.Sprintf("func(%s str, %s %s) str", argNameTemplate, argNameVars, obj.Type.String())
+		str := fmt.Sprintf("func(%s str, %s %s) str", templateArgNameTemplate, templateArgNameVars, obj.Type.String())
 		sig = types.NewType(str)
 	}
 	return &interfaces.Info{
@@ -509,8 +510,8 @@ func (obj *TemplateFunc) Stream() error {
 
 			st := input.Struct()
 
-			tmpl := st[argNameTemplate].Str()
-			vars, exists := st[argNameVars]
+			tmpl := st[templateArgNameTemplate].Str()
+			vars, exists := st[templateArgNameVars]
 			if !exists {
 				vars = nil
 			}
diff --git a/lang/funcs/core/world/schedule_func.go b/lang/funcs/core/world/schedule_func.go
index f98a3e18..fabe9169 100644
--- a/lang/funcs/core/world/schedule_func.go
+++ b/lang/funcs/core/world/schedule_func.go
@@ -56,8 +56,9 @@ const (
 	// keep this strict.
 	StrictScheduleOpts = true
 
-	argNameNamespace = "namespace"
-	argNameOpts      = "opts"
+	// arg names...
+	scheduleArgNameNamespace = "namespace"
+	scheduleArgNameOpts      = "opts"
 )
 
 func init() {
@@ -101,7 +102,7 @@ func (obj *SchedulePolyFunc) validOpts() map[string]*types.Type {
 
 // ArgGen returns the Nth arg name for this function.
 func (obj *SchedulePolyFunc) ArgGen(index int) (string, error) {
-	seq := []string{argNameNamespace, argNameOpts} // 2nd arg is optional
+	seq := []string{scheduleArgNameNamespace, scheduleArgNameOpts} // 2nd arg is optional
 	if l := len(seq); index >= l {
 		return "", fmt.Errorf("index %d exceeds arg length of %d", index, l)
 	}
@@ -272,8 +273,8 @@ func (obj *SchedulePolyFunc) Unify(expr interfaces.Expr) ([]interfaces.Invariant
 				}
 				invariants = append(invariants, invar)
 
-				mapped[argNameOpts] = dummyOpts
-				ordered = append(ordered, argNameOpts)
+				mapped[scheduleArgNameOpts] = dummyOpts
+				ordered = append(ordered, scheduleArgNameOpts)
 			}
 
 			invar = &interfaces.EqualityWrapFuncInvariant{
@@ -544,13 +545,13 @@ func (obj *SchedulePolyFunc) Stream() error {
 			}
 			obj.last = input // store for next
 
-			namespace := input.Struct()[argNameNamespace].Str()
+			namespace := input.Struct()[scheduleArgNameNamespace].Str()
 			if namespace == "" {
 				return fmt.Errorf("can't use an empty namespace")
 			}
 
 			opts := make(map[string]types.Value) // empty "struct"
-			if val, exists := input.Struct()[argNameOpts]; exists {
+			if val, exists := input.Struct()[scheduleArgNameOpts]; exists {
 				opts = val.Struct()
 			}
 
diff --git a/lang/funcs/history_polyfunc.go b/lang/funcs/history_polyfunc.go
index 1db76d98..f51bc0c7 100644
--- a/lang/funcs/history_polyfunc.go
+++ b/lang/funcs/history_polyfunc.go
@@ -29,6 +29,10 @@ const (
 	// HistoryFuncName is the name this function is registered as. This
 	// starts with an underscore so that it cannot be used from the lexer.
 	HistoryFuncName = "_history"
+
+	// arg names...
+	historyArgNameValue = "value"
+	historyArgNameIndex = "index"
 )
 
 func init() {
@@ -66,7 +70,7 @@ func (obj *HistoryFunc) String() string {
 
 // ArgGen returns the Nth arg name for this function.
 func (obj *HistoryFunc) ArgGen(index int) (string, error) {
-	seq := []string{"value", "index"}
+	seq := []string{historyArgNameValue, historyArgNameIndex}
 	if l := len(seq); index >= l {
 		return "", fmt.Errorf("index %d exceeds arg length of %d", index, l)
 	}
@@ -376,8 +380,8 @@ func (obj *HistoryFunc) Stream() error {
 			//}
 			//obj.last = input // store for next
 
-			index := int(input.Struct()["index"].Int())
-			value := input.Struct()["value"]
+			index := int(input.Struct()[historyArgNameIndex].Int())
+			value := input.Struct()[historyArgNameValue]
 			var result types.Value
 
 			if index < 0 {
diff --git a/lang/funcs/maplookup_polyfunc.go b/lang/funcs/maplookup_polyfunc.go
index ebd28849..180b8332 100644
--- a/lang/funcs/maplookup_polyfunc.go
+++ b/lang/funcs/maplookup_polyfunc.go
@@ -31,9 +31,10 @@ const (
 	// XXX: change to _maplookup and add syntax in the lexer/parser
 	MapLookupFuncName = "maplookup"
 
-	argNameMap = "map"
-	argNameKey = "key"
-	argNameDef = "default"
+	// arg names...
+	mapLookupArgNameMap = "map"
+	mapLookupArgNameKey = "key"
+	mapLookupArgNameDef = "default"
 )
 
 func init() {
@@ -60,7 +61,7 @@ func (obj *MapLookupPolyFunc) String() string {
 
 // ArgGen returns the Nth arg name for this function.
 func (obj *MapLookupPolyFunc) ArgGen(index int) (string, error) {
-	seq := []string{argNameMap, argNameKey, argNameDef}
+	seq := []string{mapLookupArgNameMap, mapLookupArgNameKey, mapLookupArgNameDef}
 	if l := len(seq); index >= l {
 		return "", fmt.Errorf("index %d exceeds arg length of %d", index, l)
 	}
@@ -433,20 +434,20 @@ func (obj *MapLookupPolyFunc) Polymorphisms(partialType *types.Type, partialValu
 	typFunc := &types.Type{
 		Kind: types.KindFunc, // function type
 		Map:  make(map[string]*types.Type),
-		Ord:  []string{argNameMap, argNameKey, argNameDef},
+		Ord:  []string{mapLookupArgNameMap, mapLookupArgNameKey, mapLookupArgNameDef},
 		Out:  nil,
 	}
-	typFunc.Map[argNameMap] = typ
-	typFunc.Map[argNameKey] = typ.Key
-	typFunc.Map[argNameDef] = typ.Val
+	typFunc.Map[mapLookupArgNameMap] = typ
+	typFunc.Map[mapLookupArgNameKey] = typ.Key
+	typFunc.Map[mapLookupArgNameDef] = typ.Val
 	typFunc.Out = typ.Val
 
 	// TODO: don't include partial internal func map's for now, allow in future?
 	if typ.Key == nil || typ.Val == nil {
 		typFunc.Map = make(map[string]*types.Type) // erase partial
-		typFunc.Map[argNameMap] = types.TypeVariant
-		typFunc.Map[argNameKey] = types.TypeVariant
-		typFunc.Map[argNameDef] = types.TypeVariant
+		typFunc.Map[mapLookupArgNameMap] = types.TypeVariant
+		typFunc.Map[mapLookupArgNameKey] = types.TypeVariant
+		typFunc.Map[mapLookupArgNameDef] = types.TypeVariant
 	}
 	if typ.Val == nil {
 		typFunc.Out = types.TypeVariant
@@ -568,9 +569,9 @@ func (obj *MapLookupPolyFunc) Stream() error {
 			}
 			obj.last = input // store for next
 
-			m := (input.Struct()[argNameMap]).(*types.MapValue)
-			key := input.Struct()[argNameKey]
-			def := input.Struct()[argNameDef]
+			m := (input.Struct()[mapLookupArgNameMap]).(*types.MapValue)
+			key := input.Struct()[mapLookupArgNameKey]
+			def := input.Struct()[mapLookupArgNameDef]
 
 			var result types.Value
 			val, exists := m.Lookup(key)
diff --git a/lang/funcs/structlookup_polyfunc.go b/lang/funcs/structlookup_polyfunc.go
index 7f582db1..f0ca5649 100644
--- a/lang/funcs/structlookup_polyfunc.go
+++ b/lang/funcs/structlookup_polyfunc.go
@@ -30,6 +30,10 @@ const (
 	// starts with an underscore so that it cannot be used from the lexer.
 	// XXX: change to _structlookup and add syntax in the lexer/parser
 	StructLookupFuncName = "structlookup"
+
+	// arg names...
+	structLookupArgNameStruct = "struct"
+	structLookupArgNameField  = "field"
 )
 
 func init() {
@@ -58,7 +62,7 @@ func (obj *StructLookupPolyFunc) String() string {
 
 // ArgGen returns the Nth arg name for this function.
 func (obj *StructLookupPolyFunc) ArgGen(index int) (string, error) {
-	seq := []string{"struct", "field"}
+	seq := []string{structLookupArgNameStruct, structLookupArgNameField}
 	if l := len(seq); index >= l {
 		return "", fmt.Errorf("index %d exceeds arg length of %d", index, l)
 	}
@@ -369,15 +373,15 @@ func (obj *StructLookupPolyFunc) Polymorphisms(partialType *types.Type, partialV
 	typFunc := &types.Type{
 		Kind: types.KindFunc, // function type
 		Map:  make(map[string]*types.Type),
-		Ord:  []string{"struct", "field"},
+		Ord:  []string{structLookupArgNameStruct, structLookupArgNameField},
 		Out:  out,
 	}
-	typFunc.Map["struct"] = typ
-	typFunc.Map["field"] = types.TypeStr
+	typFunc.Map[structLookupArgNameStruct] = typ
+	typFunc.Map[structLookupArgNameField] = types.TypeStr
 
 	// set variant instead of nil
-	if typFunc.Map["struct"] == nil {
-		typFunc.Map["struct"] = types.TypeVariant
+	if typFunc.Map[structLookupArgNameStruct] == nil {
+		typFunc.Map[structLookupArgNameStruct] = types.TypeVariant
 	}
 	if out == nil {
 		typFunc.Out = types.TypeVariant
@@ -490,8 +494,8 @@ func (obj *StructLookupPolyFunc) Stream() error {
 			}
 			obj.last = input // store for next
 
-			st := (input.Struct()["struct"]).(*types.StructValue)
-			field := input.Struct()["field"].Str()
+			st := (input.Struct()[structLookupArgNameStruct]).(*types.StructValue)
+			field := input.Struct()[structLookupArgNameField].Str()
 
 			if field == "" {
 				return fmt.Errorf("received empty field")