Question

从0.13.7迁移后，我正在使用SBT 1.2.8；使用的旧变体例如以<+=代替+=，例如unmanagedClasspath in Compile += baseDirectory map { bd => Attributed.blank(bd / ".." / "config") },，但已删除此类运算符。

我看到了其他一些相关问题，但是所涉及的类型似乎相差很大，对我无济于事：

No implicit for Append.Value[...] found with Def.task to generate files in SBT 0.13?
sbt: No implicit for Append.Value[Seq[java.io.File], sbt.Def.Initialize[java.io.File]] found,）

文件中三个相关的连续行是：

  unmanagedClasspath in Compile += baseDirectory map { bd => Attributed.blank(bd / ".." / "config") },
  unmanagedClasspath in Runtime ++= (unmanagedClasspath in Compile),
  unmanagedClasspath in Test ++= (unmanagedClasspath in Compile),

这会产生以下错误：

build.sbt:70: error: No implicit for Append.Value[sbt.Keys.Classpath, sbt.Def.Initialize[sbt.Task[sbt.internal.util.Attributed[java.io.File]]]] found,
  so sbt.Def.Initialize[sbt.Task[sbt.internal.util.Attributed[java.io.File]]] cannot be appended to sbt.Keys.Classpath
  unmanagedClasspath in Compile += baseDirectory map { bd => Attributed.blank(bd / ".." / "config") },
                                ^
build.sbt:71: error: No implicit for Append.Values[sbt.Keys.Classpath, sbt.TaskKey[sbt.Keys.Classpath]] found,
  so sbt.TaskKey[sbt.Keys.Classpath] cannot be appended to sbt.Keys.Classpath
  unmanagedClasspath in Runtime ++= (unmanagedClasspath in Compile),
                                ^
build.sbt:72: error: No implicit for Append.Values[sbt.Keys.Classpath, sbt.TaskKey[sbt.Keys.Classpath]] found,
  so sbt.TaskKey[sbt.Keys.Classpath] cannot be appended to sbt.Keys.Classpath
  unmanagedClasspath in Test ++= (unmanagedClasspath in Compile),

如果这还不够，请使用full build.sbt，稍后将很高兴在内联相关位。

Answer 1

斜视一下之后，我终于可以解决此问题，并进行以下更改。在每种情况下，关键是要识别在哪里访问所讨论的.value。

  unmanagedClasspath in Compile += baseDirectory.value / ".." / "config",
  unmanagedClasspath in Runtime ++= (unmanagedClasspath in Compile).value,
  unmanagedClasspath in Test ++= (unmanagedClasspath in Compile).value,

除了以上链接之外，以下文档似乎对您有所帮助： -https://www.scala-sbt.org/1.0/docs/Tasks.html

从0.13.x升级到SBT 1.x.x时，如何解决各种“ Append.Value [...]没有隐式”错误？

1 个答案: