问在命令行或文本编辑器中在SBT下执行项目的Scala文件？

EN

scala> :load src/main/scala/objsets/TweetSet.scala
Loading src/main/scala/objsets/TweetSet.scala...
<console>:1: error: illegal start of definition
package objsets
^
<console>:10: error: not found: value TweetReader
       import TweetReader._
              ^
import common._
defined class Tweet
<console>:2: error: illegal start of statement (no modifiers allowed here)
  override def toString: String =
  ^

$ tree src/
src/
├── main
│   └── scala
│       ├── common
│       │   └── package.scala
│       └── objsets
│           ├── TweetData.scala
│           ├── TweetReader.scala
│           ├── TweetSet.scala
│           └── testing.sc
└── test
    └── scala
        └── objsets
            └── TweetSetSuite.scala

7 directories, 6 files
$ cat build.sbt assignment.sbt 
name := course.value + "-" + assignment.value

scalaVersion := "2.11.7"

scalacOptions ++= Seq("-deprecation")

// grading libraries
libraryDependencies += "junit" % "junit" % "4.10" % Test

// for funsets
libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "1.0.4"

// include the common dir
commonSourcePackages += "common"

courseId := "bRPXgjY9EeW6RApRXdjJPw"

course := "progfun1"
assignment := "objsets"

assignmentInfo := AssignmentInfo(
  key = "6PTXvD99EeWAiCIAC7Pj9w",
  itemId = "d1FGp",
  premiumItemId = Some("Ogg05"),
  partId = "7hlkb",
  styleSheet = Some((_: File) / "scalastyle" / "scalastyle_config.xml")
)