Reduced token size

src/build/token/Token.go

@@ -10,13 +10,13 @@ import (
 // This makes parsing easier and allows us to do better syntax checks.
 type Token struct {
 	Bytes    []byte
-	Position int
+	Position Position
 	Kind     Kind
 }
 
 // End returns the position after the token.
-func (t *Token) End() int {
-	return t.Position + len(t.Bytes)
+func (t *Token) End() Position {
+	return t.Position + Position(len(t.Bytes))
 }
 
 // String creates a human readable representation for debugging purposes.