Scala 解析器削减最后一个括号

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
    }      

结果是:

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

我期望:

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

最后一个括号}如果我使用来自 Tree 对象的位置，(和行尾)会丢失:text.substring(t.pos.start, t.pos.end)
任何建议如何从 scala.reflect.api.Trees#Tree 对象中提取所有文本？

更新

受影响的Scala版本:

2.10.6 - sbt 0.13.x 需要

2.11.8

2.12.7

对于 scala 2.10.6/2.12.7 结果与上面的输出相同。

将项目添加到 github

Example project for searching the solution

Answer 1

只是为了将问题从未回答列表中移出，可以引用为其预订的问题:

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