diff --git a/calc/calc.go b/calc/calc.go
index 6dcd304..a4d6f8a 100644
--- a/calc/calc.go
+++ b/calc/calc.go
@@ -12,22 +12,22 @@ var (
 	sumOp  = Chars("+-", 1, 1)
 	prodOp = Chars("/*", 1, 1)
 
-	groupExpr = Seq("(", sum, ")").Map(func(n Result) Result {
-		return Result{Result: n.Child[1].Result}
+	groupExpr = Seq("(", sum, ")").Map(func(n *Result) {
+		n.Result = n.Child[1].Result
 	})
 
-	number = NumberLit().Map(func(n Result) Result {
+	number = NumberLit().Map(func(n *Result) {
 		switch i := n.Result.(type) {
 		case int64:
-			return Result{Result: float64(i)}
+			n.Result = float64(i)
 		case float64:
-			return Result{Result: i}
+			n.Result = i
 		default:
 			panic(fmt.Errorf("unknown value %#v", i))
 		}
 	})
 
-	sum = Seq(prod, Some(Seq(sumOp, prod))).Map(func(n Result) Result {
+	sum = Seq(prod, Some(Seq(sumOp, prod))).Map(func(n *Result) {
 		i := n.Child[0].Result.(float64)
 
 		for _, op := range n.Child[1].Child {
@@ -39,10 +39,10 @@ var (
 			}
 		}
 
-		return Result{Result: i}
+		n.Result = i
 	})
 
-	prod = Seq(&value, Some(Seq(prodOp, &value))).Map(func(n Result) Result {
+	prod = Seq(&value, Some(Seq(prodOp, &value))).Map(func(n *Result) {
 		i := n.Child[0].Result.(float64)
 
 		for _, op := range n.Child[1].Child {
@@ -54,7 +54,7 @@ var (
 			}
 		}
 
-		return Result{Result: i}
+		n.Result = i
 	})
 
 	y = Maybe(sum)
diff --git a/combinator.go b/combinator.go
index 01386e6..0c4e0f5 100644
--- a/combinator.go
+++ b/combinator.go
@@ -8,52 +8,48 @@ import (
 func Seq(parsers ...Parserish) Parser {
 	parserfied := ParsifyAll(parsers...)
 
-	return NewParser("Seq()", func(ps *State) Result {
-		result := Result{Child: make([]Result, len(parserfied))}
+	return NewParser("Seq()", func(ps *State, node *Result) {
+		node.Child = make([]Result, len(parserfied))
 		startpos := ps.Pos
 		for i, parser := range parserfied {
-			result.Child[i] = parser(ps)
+			parser(ps, &node.Child[i])
 			if ps.Errored() {
 				ps.Pos = startpos
-				return result
+				return
 			}
 		}
-		return result
 	})
 }
 
 // NoAutoWS disables automatically ignoring whitespace between tokens for all parsers underneath
 func NoAutoWS(parser Parserish) Parser {
 	parserfied := Parsify(parser)
-	return func(ps *State) Result {
+	return func(ps *State, node *Result) {
 		ps.NoAutoWS = true
-
-		ret := parserfied(ps)
-
+		parserfied(ps, node)
 		ps.NoAutoWS = false
-		return ret
 	}
 }
 
 // Any matches the first successful parser and returns its result
 func Any(parsers ...Parserish) Parser {
 	parserfied := ParsifyAll(parsers...)
-	// For
+	// Records which parser was successful for each byte, and will use it first next time.
 	predictor := [255]int{}
 
-	return NewParser("Any()", func(ps *State) Result {
+	return NewParser("Any()", func(ps *State, node *Result) {
 		if ps.Pos >= len(ps.Input) {
 			ps.ErrorHere("!EOF")
-			return Result{}
+			return
 		}
 		longestError := Error{}
 		startpos := ps.Pos
 		predictorChar := ps.Input[startpos]
 		predicted := predictor[predictorChar]
 
-		node := parserfied[predicted](ps)
+		parserfied[predicted](ps, node)
 		if !ps.Errored() {
-			return node
+			return
 		}
 
 		if ps.Error.pos >= longestError.pos {
@@ -62,14 +58,14 @@ func Any(parsers ...Parserish) Parser {
 		if ps.Cut <= startpos {
 			ps.Recover()
 		} else {
-			return node
+			return
 		}
 
 		for i, parser := range parserfied {
 			if i == predicted {
 				continue
 			}
-			node := parser(ps)
+			parser(ps, node)
 			if ps.Errored() {
 				if ps.Error.pos >= longestError.pos {
 					longestError = ps.Error
@@ -81,12 +77,11 @@ func Any(parsers ...Parserish) Parser {
 				continue
 			}
 			predictor[predictorChar] = i
-			return node
+			return
 		}
 
 		ps.Error = longestError
 		ps.Pos = startpos
-		return Result{}
 	})
 }
 
@@ -111,26 +106,26 @@ func manyImpl(min int, op Parserish, sep ...Parserish) Parser {
 		sepParser = Parsify(sep[0])
 	}
 
-	return func(ps *State) Result {
+	return func(ps *State, node *Result) {
 		var result Result
 		startpos := ps.Pos
 		for {
-			node := opParser(ps)
+			opParser(ps, &result)
 			if ps.Errored() {
-				if len(result.Child) < min || ps.Cut > ps.Pos {
+				if len(node.Child) < min || ps.Cut > ps.Pos {
 					ps.Pos = startpos
-					return result
+					return
 				}
 				ps.Recover()
-				return result
+				return
 			}
-			result.Child = append(result.Child, node)
+			node.Child = append(node.Child, result)
 
 			if sepParser != nil {
-				sepParser(ps)
+				sepParser(ps, TrashResult)
 				if ps.Errored() {
 					ps.Recover()
-					return result
+					return
 				}
 			}
 		}
@@ -141,14 +136,12 @@ func manyImpl(min int, op Parserish, sep ...Parserish) Parser {
 func Maybe(parser Parserish) Parser {
 	parserfied := Parsify(parser)
 
-	return NewParser("Maybe()", func(ps *State) Result {
+	return NewParser("Maybe()", func(ps *State, node *Result) {
 		startpos := ps.Pos
-		node := parserfied(ps)
+		parserfied(ps, node)
 		if ps.Errored() && ps.Cut <= startpos {
 			ps.Recover()
 		}
-
-		return node
 	})
 }
 
@@ -158,49 +151,42 @@ func Maybe(parser Parserish) Parser {
 func Bind(parser Parserish, val interface{}) Parser {
 	p := Parsify(parser)
 
-	return func(ps *State) Result {
-		node := p(ps)
+	return func(ps *State, node *Result) {
+		p(ps, node)
 		if ps.Errored() {
-			return node
+			return
 		}
 		node.Result = val
-		return node
+		return
 	}
 }
 
 // Map applies the callback if the parser matches. This is used to set the Result
 // based on the matched result.
-func Map(parser Parserish, f func(n Result) Result) Parser {
+func Map(parser Parserish, f func(n *Result)) Parser {
 	p := Parsify(parser)
 
-	return func(ps *State) Result {
-		node := p(ps)
+	return func(ps *State, node *Result) {
+		p(ps, node)
 		if ps.Errored() {
-			return node
+			return
 		}
-		return f(node)
+		f(node)
 	}
 }
 
-func flatten(n Result) string {
-	if n.Token != "" {
-		return n.Token
-	}
-
+func flatten(n *Result) {
 	if len(n.Child) > 0 {
 		sbuf := &bytes.Buffer{}
-		for _, node := range n.Child {
-			sbuf.WriteString(flatten(node))
+		for _, child := range n.Child {
+			flatten(&child)
+			sbuf.WriteString(child.Token)
 		}
-		return sbuf.String()
+		n.Token = sbuf.String()
 	}
-
-	return ""
 }
 
 // Merge all child Tokens together recursively
 func Merge(parser Parserish) Parser {
-	return Map(parser, func(n Result) Result {
-		return Result{Token: flatten(n)}
-	})
+	return Map(parser, flatten)
 }
diff --git a/combinator_test.go b/combinator_test.go
index 1c95eba..c1eedb3 100644
--- a/combinator_test.go
+++ b/combinator_test.go
@@ -165,8 +165,8 @@ type htmlTag struct {
 }
 
 func TestMap(t *testing.T) {
-	parser := Map(Seq("<", Chars("a-zA-Z0-9"), ">"), func(n Result) Result {
-		return Result{Result: htmlTag{n.Child[1].Token}}
+	parser := Seq("<", Chars("a-zA-Z0-9"), ">").Map(func(n *Result) {
+		n.Result = htmlTag{n.Child[1].Token}
 	})
 
 	t.Run("success", func(t *testing.T) {
@@ -235,8 +235,8 @@ func TestMerge(t *testing.T) {
 }
 
 func TestMapShorthand(t *testing.T) {
-	Chars("a-z").Map(func(n Result) Result {
-		return Result{Result: n.Token}
+	Chars("a-z").Map(func(n *Result) {
+		n.Result = n.Token
 	})
 }
 
diff --git a/debugon.go b/debugon.go
index b976839..60efe60 100644
--- a/debugon.go
+++ b/debugon.go
@@ -53,7 +53,7 @@ func (dp *debugParser) logf(ps *State, result *Result, format string, args ...in
 	buf.WriteString(fmt.Sprintf("%-10s | ", output))
 	buf.WriteString(strings.Repeat("  ", len(activeParsers)-1))
 	buf.WriteString(fmt.Sprintf(format, args...))
-
+	buf.WriteString(fmt.Sprintf(" > %#v", result))
 	buf.WriteRune('\n')
 	return buf.String()
 }
@@ -77,14 +77,14 @@ func (dp *debugParser) logEnd(ps *State, result *Result) {
 	}
 }
 
-func (dp *debugParser) Parse(ps *State) Result {
+func (dp *debugParser) Parse(ps *State, node *Result) {
 	activeParsers = append(activeParsers, dp)
 	start := time.Now()
 	dp.SelfStart = start
 
 	dp.logStart(ps)
-	ret := dp.Next(ps)
-	dp.logEnd(ps, &ret)
+	dp.Next(ps, node)
+	dp.logEnd(ps, node)
 
 	dp.Cumulative += time.Since(start)
 	dp.Self += time.Since(dp.SelfStart)
@@ -94,7 +94,6 @@ func (dp *debugParser) Parse(ps *State) Result {
 	}
 
 	activeParsers = activeParsers[0 : len(activeParsers)-1]
-	return ret
 }
 
 // NewParser should be called around the creation of every Parser.
@@ -109,13 +108,12 @@ func NewParser(name string, p Parser) Parser {
 		Location: location,
 	}
 
-	dp.Next = func(ps *State) Result {
+	dp.Next = func(ps *State, ret *Result) {
 		dp.Self += time.Since(dp.SelfStart)
 
-		ret := p(ps)
+		p(ps, ret)
 
 		dp.SelfStart = time.Now()
-		return ret
 	}
 
 	if len(dp.Location) > longestLocation {
diff --git a/html/html.go b/html/html.go
index 33e5cc4..05e091b 100644
--- a/html/html.go
+++ b/html/html.go
@@ -18,28 +18,26 @@ var (
 	tag Parser
 
 	identifier = Regex("[a-zA-Z][a-zA-Z0-9]*")
-	text       = NotChars("<>").Map(func(n Result) Result {
-		return Result{Result: n.Token}
-	})
+	text       = NotChars("<>").Map(func(n *Result) { n.Result = n.Token })
 
 	element  = Any(text, &tag)
-	elements = Some(element).Map(func(n Result) Result {
+	elements = Some(element).Map(func(n *Result) {
 		ret := []interface{}{}
 		for _, child := range n.Child {
 			ret = append(ret, child.Result)
 		}
-		return Result{Result: ret}
+		n.Result = ret
 	})
 
 	attr  = Seq(identifier, "=", StringLit(`"'`))
-	attrs = Some(attr).Map(func(node Result) Result {
+	attrs = Some(attr).Map(func(node *Result) {
 		attr := map[string]string{}
 
 		for _, attrNode := range node.Child {
 			attr[attrNode.Child[0].Token] = attrNode.Child[2].Result.(string)
 		}
 
-		return Result{Result: attr}
+		node.Result = attr
 	})
 
 	tstart = Seq("<", identifier, Cut(), attrs, ">")
@@ -47,13 +45,12 @@ var (
 )
 
 func init() {
-	tag = Seq(tstart, Cut(), elements, tend).Map(func(node Result) Result {
+	tag = Seq(tstart, Cut(), elements, tend).Map(func(node *Result) {
 		openTag := node.Child[0]
-		return Result{Result: htmlTag{
+		node.Result = htmlTag{
 			Name:       openTag.Child[1].Token,
 			Attributes: openTag.Child[3].Result.(map[string]string),
 			Body:       node.Child[2].Result.([]interface{}),
-		}}
-
+		}
 	})
 }
diff --git a/html/html_test.go b/html/html_test.go
index 7649fdd..79b0191 100644
--- a/html/html_test.go
+++ b/html/html_test.go
@@ -1,12 +1,15 @@
 package html
 
 import (
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	"github.com/vektah/goparsify"
 )
 
 func TestParse(t *testing.T) {
+	goparsify.EnableLogging(os.Stdout)
 	result, err := parse(`<body>hello <p color="blue">world</p></body>`)
 	require.NoError(t, err)
 	require.Equal(t, htmlTag{Name: "body", Attributes: map[string]string{}, Body: []interface{}{
diff --git a/json/json.go b/json/json.go
index 7cc53a1..9b1e8e9 100644
--- a/json/json.go
+++ b/json/json.go
@@ -13,22 +13,22 @@ var (
 	_number     = NumberLit()
 	_properties = Some(Seq(StringLit(`"`), ":", &_value), ",")
 
-	_array = Seq("[", Cut(), Some(&_value, ","), "]").Map(func(n Result) Result {
+	_array = Seq("[", Cut(), Some(&_value, ","), "]").Map(func(n *Result) {
 		ret := []interface{}{}
 		for _, child := range n.Child[2].Child {
 			ret = append(ret, child.Result)
 		}
-		return Result{Result: ret}
+		n.Result = ret
 	})
 
-	_object = Seq("{", Cut(), _properties, "}").Map(func(n Result) Result {
+	_object = Seq("{", Cut(), _properties, "}").Map(func(n *Result) {
 		ret := map[string]interface{}{}
 
 		for _, prop := range n.Child[2].Child {
 			ret[prop.Child[0].Result.(string)] = prop.Child[2].Result
 		}
 
-		return Result{Result: ret}
+		n.Result = ret
 	})
 )
 
diff --git a/literals.go b/literals.go
index ec508e3..1287001 100644
--- a/literals.go
+++ b/literals.go
@@ -11,12 +11,12 @@ import (
 //  - escaped characters, eg \" or \n
 //  - unicode sequences, eg \uBEEF
 func StringLit(allowedQuotes string) Parser {
-	return NewParser("string literal", func(ps *State) Result {
+	return NewParser("string literal", func(ps *State, node *Result) {
 		ps.AutoWS()
 
 		if !stringContainsByte(allowedQuotes, ps.Input[ps.Pos]) {
 			ps.ErrorHere(allowedQuotes)
-			return Result{}
+			return
 		}
 		quote := ps.Input[ps.Pos]
 
@@ -30,7 +30,7 @@ func StringLit(allowedQuotes string) Parser {
 			case '\\':
 				if end+1 >= inputLen {
 					ps.ErrorHere(string(quote))
-					return Result{}
+					return
 				}
 
 				if buf == nil {
@@ -42,14 +42,14 @@ func StringLit(allowedQuotes string) Parser {
 					if end+6 >= inputLen {
 						ps.Error.expected = "[a-f0-9]{4}"
 						ps.Error.pos = end + 2
-						return Result{}
+						return
 					}
 
 					r, ok := unhex(ps.Input[end+2 : end+6])
 					if !ok {
 						ps.Error.expected = "[a-f0-9]"
 						ps.Error.pos = end + 2
-						return Result{}
+						return
 					}
 					buf.WriteRune(r)
 					end += 6
@@ -59,12 +59,13 @@ func StringLit(allowedQuotes string) Parser {
 				}
 			case quote:
 				if buf == nil {
-					result := ps.Input[ps.Pos+1 : end]
+					node.Result = ps.Input[ps.Pos+1 : end]
 					ps.Pos = end + 1
-					return Result{Result: result}
+					return
 				}
 				ps.Pos = end + 1
-				return Result{Result: buf.String()}
+				node.Result = buf.String()
+				return
 			default:
 				if buf == nil {
 					if ps.Input[end] < 127 {
@@ -82,13 +83,12 @@ func StringLit(allowedQuotes string) Parser {
 		}
 
 		ps.ErrorHere(string(quote))
-		return Result{}
 	})
 }
 
 // NumberLit matches a floating point or integer number and returns it as a int64 or float64 in .Result
 func NumberLit() Parser {
-	return NewParser("number literal", func(ps *State) Result {
+	return NewParser("number literal", func(ps *State, node *Result) {
 		ps.AutoWS()
 		end := ps.Pos
 		float := false
@@ -126,22 +126,20 @@ func NumberLit() Parser {
 
 		if end == ps.Pos {
 			ps.ErrorHere("number")
-			return Result{}
+			return
 		}
 
-		var result interface{}
 		var err error
 		if float {
-			result, err = strconv.ParseFloat(ps.Input[ps.Pos:end], 10)
+			node.Result, err = strconv.ParseFloat(ps.Input[ps.Pos:end], 10)
 		} else {
-			result, err = strconv.ParseInt(ps.Input[ps.Pos:end], 10, 64)
+			node.Result, err = strconv.ParseInt(ps.Input[ps.Pos:end], 10, 64)
 		}
 		if err != nil {
 			ps.ErrorHere("number")
-			return Result{}
+			return
 		}
 		ps.Pos = end
-		return Result{Result: result}
 	})
 }
 
diff --git a/parser.go b/parser.go
index 86f2e05..a43bc19 100644
--- a/parser.go
+++ b/parser.go
@@ -7,6 +7,8 @@ import (
 	"unicode/utf8"
 )
 
+var TrashResult = &Result{}
+
 // Result is the output of a parser. Usually only one of its fields will be set and should be though of
 // more as a union type. having it avoids interface{} littered all through the parsing code and makes
 // the it easy to do the two most common operations, getting a token and finding a child.
@@ -22,10 +24,10 @@ type Result struct {
 //  - A parser that errors must set state.Error
 //  - A parser that errors must not change state.Pos
 //  - A parser that consumed some input should advance state.Pos
-type Parser func(*State) Result
+type Parser func(*State, *Result)
 
 // Map shorthand for Map(p, func())
-func (p Parser) Map(f func(n Result) Result) Parser {
+func (p Parser) Map(f func(n *Result)) Parser {
 	return Map(p, f)
 }
 
@@ -51,14 +53,14 @@ type Parserish interface{}
 // See Parserish for details.
 func Parsify(p Parserish) Parser {
 	switch p := p.(type) {
-	case func(*State) Result:
+	case func(*State, *Result):
 		return p
 	case Parser:
 		return p
 	case *Parser:
 		// Todo: Maybe capture this stack and on nil show it? Is there a good error library to do this?
-		return func(ptr *State) Result {
-			return (*p)(ptr)
+		return func(ptr *State, node *Result) {
+			(*p)(ptr, node)
 		}
 	case string:
 		return Exact(p)
@@ -85,7 +87,8 @@ func Run(parser Parserish, input string, ws ...VoidParser) (result interface{},
 		ps.WS = ws[0]
 	}
 
-	ret := p(ps)
+	ret := Result{}
+	p(ps, &ret)
 	ps.AutoWS()
 
 	if ps.Error.expected != "" {
@@ -101,32 +104,30 @@ func Run(parser Parserish, input string, ws ...VoidParser) (result interface{},
 
 // WS will consume whitespace, it should only be needed when AutoWS is turned off
 func WS() Parser {
-	return NewParser("AutoWS", func(ps *State) Result {
+	return NewParser("AutoWS", func(ps *State, ret *Result) {
 		ps.WS(ps)
-		return Result{}
 	})
 }
 
 // Cut prevents backtracking beyond this point. Usually used after keywords when you
 // are sure this is the correct path. Improves performance and error reporting.
 func Cut() Parser {
-	return func(ps *State) Result {
+	return func(ps *State, node *Result) {
 		ps.Cut = ps.Pos
-		return Result{}
 	}
 }
 
 // Regex returns a match if the regex successfully matches
 func Regex(pattern string) Parser {
 	re := regexp.MustCompile("^" + pattern)
-	return NewParser(pattern, func(ps *State) Result {
+	return NewParser(pattern, func(ps *State, node *Result) {
 		ps.AutoWS()
 		if match := re.FindString(ps.Get()); match != "" {
 			ps.Advance(len(match))
-			return Result{Token: match}
+			node.Token = match
+			return
 		}
 		ps.ErrorHere(pattern)
-		return Result{}
 	})
 }
 
@@ -134,29 +135,29 @@ func Regex(pattern string) Parser {
 func Exact(match string) Parser {
 	if len(match) == 1 {
 		matchByte := match[0]
-		return NewParser(match, func(ps *State) Result {
+		return NewParser(match, func(ps *State, node *Result) {
 			ps.AutoWS()
 			if ps.Pos >= len(ps.Input) || ps.Input[ps.Pos] != matchByte {
 				ps.ErrorHere(match)
-				return Result{}
+				return
 			}
 
 			ps.Advance(1)
 
-			return Result{Token: match}
+			node.Token = match
 		})
 	}
 
-	return NewParser(match, func(ps *State) Result {
+	return NewParser(match, func(ps *State, node *Result) {
 		ps.AutoWS()
 		if !strings.HasPrefix(ps.Get(), match) {
 			ps.ErrorHere(match)
-			return Result{}
+			return
 		}
 
 		ps.Advance(len(match))
 
-		return Result{Token: match}
+		node.Token = match
 	})
 }
 
@@ -222,7 +223,7 @@ func charsImpl(matcher string, stopOn bool, repetition ...int) Parser {
 	min, max := parseRepetition(1, -1, repetition...)
 	alphabet, ranges := parseMatcher(matcher)
 
-	return func(ps *State) Result {
+	return func(ps *State, node *Result) {
 		ps.AutoWS()
 		matched := 0
 		for ps.Pos+matched < len(ps.Input) {
@@ -250,11 +251,10 @@ func charsImpl(matcher string, stopOn bool, repetition ...int) Parser {
 
 		if matched < min {
 			ps.ErrorHere(matcher)
-			return Result{}
+			return
 		}
 
-		result := ps.Input[ps.Pos : ps.Pos+matched]
+		node.Token = ps.Input[ps.Pos : ps.Pos+matched]
 		ps.Advance(matched)
-		return Result{Token: result}
 	}
 }
diff --git a/parser_test.go b/parser_test.go
index bc2867e..c64b70a 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -7,21 +7,21 @@ import (
 )
 
 func TestParsify(t *testing.T) {
-
+	result := Result{}
 	t.Run("strings", func(t *testing.T) {
-		require.Equal(t, "ff", Parsify("ff")(NewState("ffooo")).Token)
+		Parsify("ff")(NewState("ffooo"), &result)
+		require.Equal(t, "ff", result.Token)
 	})
 
 	t.Run("parsers", func(t *testing.T) {
-		require.Equal(t, "ff", Parsify(Chars("f"))(NewState("ffooo")).Token)
+		Parsify(Chars("f"))(NewState("ffooo"), &result)
+		require.Equal(t, "ff", result.Token)
 	})
 
 	t.Run("parser funcs", func(t *testing.T) {
-		node := Parsify(func(p *State) Result {
-			return Result{Token: "hello"}
-		})(NewState("ffooo"))
+		Parsify(func(p *State, node *Result) { node.Token = "hello" })(NewState("ffooo"), &result)
 
-		require.Equal(t, "hello", node.Token)
+		require.Equal(t, "hello", result.Token)
 	})
 
 	t.Run("*parsers", func(t *testing.T) {
@@ -29,8 +29,8 @@ func TestParsify(t *testing.T) {
 		parserfied := Parsify(&parser)
 		parser = Chars("f")
 
-		node := parserfied(NewState("ffooo"))
-		require.Equal(t, "ff", node.Token)
+		parserfied(NewState("ffooo"), &result)
+		require.Equal(t, "ff", result.Token)
 	})
 
 	require.Panics(t, func() {
@@ -41,10 +41,12 @@ func TestParsify(t *testing.T) {
 func TestParsifyAll(t *testing.T) {
 	parsers := ParsifyAll("ff", "gg")
 
-	result := parsers[0](NewState("ffooo"))
+	result := Result{}
+	parsers[0](NewState("ffooo"), &result)
 	require.Equal(t, "ff", result.Token)
 
-	result = parsers[1](NewState("ffooo"))
+	result = Result{}
+	parsers[1](NewState("ffooo"), &result)
 	require.Equal(t, "", result.Token)
 }
 
@@ -169,7 +171,7 @@ func TestRegex(t *testing.T) {
 }
 
 func TestParseString(t *testing.T) {
-	Y := Map("hello", func(n Result) Result { return Result{Result: n.Token} })
+	Y := Map("hello", func(n *Result) { n.Result = n.Token })
 
 	t.Run("full match", func(t *testing.T) {
 		result, err := Run(Y, "hello")
@@ -205,17 +207,16 @@ func TestAutoWS(t *testing.T) {
 	})
 
 	t.Run("unicode whitespace", func(t *testing.T) {
-		ps := NewState(" \u202f hello")
-		ps.WS = UnicodeWhitespace
-
-		result := Exact("hello")(ps)
-		require.Equal(t, "hello", result.Token)
+		result, ps := runParser(" \u202f hello", NoAutoWS(Seq(WS(), "hello")))
+		require.Equal(t, "hello", result.Child[1].Token)
+		require.Equal(t, "", ps.Get())
 		require.False(t, ps.Errored())
 	})
 }
 
 func runParser(input string, parser Parser) (Result, *State) {
 	ps := NewState(input)
-	result := parser(ps)
+	result := Result{}
+	parser(ps, &result)
 	return result, ps
 }