Scala的解析器切口最後托架

Question

Welcome to Scala 2.12.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_121). 
Type in expressions for evaluation. Or try :help. 

scala> :paste 
// Entering paste mode (ctrl-D to finish) 

import scala.reflect.runtime._ 
import scala.reflect.runtime.universe._ 
import scala.tools.reflect.ToolBox 

val mirror = universe.runtimeMirror(universe.getClass.getClassLoader) 
val toolbox = mirror.mkToolBox(options = "-Yrangepos") 
val text = 
    """ 
    |libraryDependencies ++= Seq("org.scala-lang" % "scala-compiler" % "2.10.4") map { 
    | (dependency) =>{ 
    |  dependency 
    | } 
    |} 
    """.stripMargin 
val parsed = toolbox.parse(text) 

val parsedTrees = parsed match { 
    case Block(stmt, expr) => 
    stmt :+ expr 
    case t: Tree => 
    Seq(t) 
} 

val statements = parsedTrees.map { (t: Tree) => 
    text.substring(t.pos.start, t.pos.end) 
} 


// Exiting paste mode, now interpreting. 

import scala.reflect.runtime._ 
import scala.reflect.runtime.universe._ 
import scala.tools.reflect.ToolBox 
mirror: reflect.runtime.universe.Mirror = JavaMirror with primordial classloader with boot classpath... 
scala> statements.head 
res0: String = 
libraryDependencies ++= Seq("org.scala-lang" % "scala-compiler" % "2.10.4") map { 
    (dependency) =>{ 
     dependency 
    }  

結果是：

scala> statements.head 
res1: String = 
libraryDependencies ++= Seq("org.scala-lang" % "scala-compiler" % "2.10.4") map { 
    (dependency) =>{ 
     dependency 
    } 

我預期：

libraryDependencies ++= Seq("org.scala-lang" % "scala-compiler" % "2.10.4") map { 
    (dependency) =>{ 
     dependency 
    } 
} 

最後括號}（和線的端部），如果我使用位置缺少from樹對象：text.substring(t.pos.start, t.pos.end)

任何pro posal如何從scala.reflect.api.Trees＃Tree對象中提取所有文本？

更新

受影響的版本階：

• 2.10.6 - 需要SBT 0.13.x
• 2.11.8
• 2.12.1

對於scala 2.10.6/2.12.1的結果與上面的輸出結果相同。

項目添加到GitHub上

Example project for searching the solution

Answer 1

只是移動的問題關閉解答列表，一個可以參考預定了它的問題：HTTP

https://issues.scala-lang.org/browse/SI-8859