diff --git a/_state.go b/_state.go
index 8b08d1eb..8f0267ef 100644
--- a/_state.go
+++ b/_state.go
@@ -566,7 +566,7 @@ func (ls *LState) rkValue(idx int) LValue {
 
 func (ls *LState) rkString(idx int) string {
 	if (idx & opBitRk) != 0 {
-		return ls.currentFrame.Fn.Proto.stringConstants[idx & ^opBitRk]
+		return ls.currentFrame.Fn.Proto.StringConstants[idx & ^opBitRk]
 	}
 	return string(ls.reg.array[ls.currentFrame.LocalBase+idx].(LString))
 }
diff --git a/_vm.go b/_vm.go
index 1d39c87d..84c35a8e 100644
--- a/_vm.go
+++ b/_vm.go
@@ -248,7 +248,7 @@ func init() {
 			RA := lbase + A
 			Bx := int(inst & 0x3ffff) //GETBX
 			//reg.Set(RA, L.getField(cf.Fn.Env, cf.Fn.Proto.Constants[Bx]))
-			reg.Set(RA, L.getFieldString(cf.Fn.Env, cf.Fn.Proto.stringConstants[Bx]))
+			reg.Set(RA, L.getFieldString(cf.Fn.Env, cf.Fn.Proto.StringConstants[Bx]))
 			return 0
 		},
 		func(L *LState, inst uint32, baseframe *callFrame) int { //OP_GETTABLE
@@ -281,7 +281,7 @@ func init() {
 			RA := lbase + A
 			Bx := int(inst & 0x3ffff) //GETBX
 			//L.setField(cf.Fn.Env, cf.Fn.Proto.Constants[Bx], reg.Get(RA))
-			L.setFieldString(cf.Fn.Env, cf.Fn.Proto.stringConstants[Bx], reg.Get(RA))
+			L.setFieldString(cf.Fn.Env, cf.Fn.Proto.StringConstants[Bx], reg.Get(RA))
 			return 0
 		},
 		func(L *LState, inst uint32, baseframe *callFrame) int { //OP_SETUPVAL
diff --git a/compile.go b/compile.go
index d3c665ae..fbf2be8f 100644
--- a/compile.go
+++ b/compile.go
@@ -359,7 +359,7 @@ type funcContext struct {
 
 func newFuncContext(sourcename string, parent *funcContext) *funcContext {
 	fc := &funcContext{
-		Proto:    newFunctionProto(sourcename),
+		Proto:    NewFunctionProto(sourcename),
 		Code:     &codeStore{make([]uint32, 0, 1024), make([]int, 0, 1024), 0},
 		Parent:   parent,
 		Upvalues: newVarNamePool(0),
@@ -1158,7 +1158,7 @@ func compileFunctionExpr(context *funcContext, funcexpr *ast.FunctionExpr, ec *e
 		if slv, ok := clv.(LString); ok {
 			sv = string(slv)
 		}
-		context.Proto.stringConstants = append(context.Proto.stringConstants, sv)
+		context.Proto.StringConstants = append(context.Proto.StringConstants, sv)
 	}
 	patchCode(context)
 } // }}}
diff --git a/function.go b/function.go
index 169e5407..fb74086f 100644
--- a/function.go
+++ b/function.go
@@ -39,7 +39,7 @@ type FunctionProto struct {
 	DbgCalls           []DbgCall
 	DbgUpvalues        []string
 
-	stringConstants []string
+	StringConstants []string
 }
 
 /* Upvalue {{{ */
@@ -87,7 +87,7 @@ func UpvalueIndex(i int) int {
 
 /* FunctionProto {{{ */
 
-func newFunctionProto(name string) *FunctionProto {
+func NewFunctionProto(name string) *FunctionProto {
 	return &FunctionProto{
 		SourceName:         name,
 		LineDefined:        0,
@@ -105,7 +105,7 @@ func newFunctionProto(name string) *FunctionProto {
 		DbgCalls:           make([]DbgCall, 0, 128),
 		DbgUpvalues:        make([]string, 0, 16),
 
-		stringConstants: make([]string, 0, 32),
+		StringConstants: make([]string, 0, 32),
 	}
 }
 
diff --git a/state.go b/state.go
index ed30a1ba..54cfd283 100644
--- a/state.go
+++ b/state.go
@@ -570,7 +570,7 @@ func (ls *LState) rkValue(idx int) LValue {
 
 func (ls *LState) rkString(idx int) string {
 	if (idx & opBitRk) != 0 {
-		return ls.currentFrame.Fn.Proto.stringConstants[idx & ^opBitRk]
+		return ls.currentFrame.Fn.Proto.StringConstants[idx & ^opBitRk]
 	}
 	return string(ls.reg.array[ls.currentFrame.LocalBase+idx].(LString))
 }
diff --git a/vm.go b/vm.go
index a92eb112..54246a98 100644
--- a/vm.go
+++ b/vm.go
@@ -300,7 +300,7 @@ func init() {
 			RA := lbase + A
 			Bx := int(inst & 0x3ffff) //GETBX
 			//reg.Set(RA, L.getField(cf.Fn.Env, cf.Fn.Proto.Constants[Bx]))
-			reg.Set(RA, L.getFieldString(cf.Fn.Env, cf.Fn.Proto.stringConstants[Bx]))
+			reg.Set(RA, L.getFieldString(cf.Fn.Env, cf.Fn.Proto.StringConstants[Bx]))
 			return 0
 		},
 		func(L *LState, inst uint32, baseframe *callFrame) int { //OP_GETTABLE
@@ -333,7 +333,7 @@ func init() {
 			RA := lbase + A
 			Bx := int(inst & 0x3ffff) //GETBX
 			//L.setField(cf.Fn.Env, cf.Fn.Proto.Constants[Bx], reg.Get(RA))
-			L.setFieldString(cf.Fn.Env, cf.Fn.Proto.stringConstants[Bx], reg.Get(RA))
+			L.setFieldString(cf.Fn.Env, cf.Fn.Proto.StringConstants[Bx], reg.Get(RA))
 			return 0
 		},
 		func(L *LState, inst uint32, baseframe *callFrame) int { //OP_SETUPVAL