These methods are not described in the documentation . I mainly use :=in my .sbt files, but sometimes due to reasons that I still don’t understand, the tasks that I assign using :=do not work (which means that the tasks do not create side effects and do not allow, t to return that anyway) and work with <<=. So what is the difference between <<=and :=?
Edit:
In my example below, the cleanup task is performed, and when this is done ( doFinally), two other tasks are performed simultaneously.
gae_prep_war := {
val after = Def.task {
(gae_copyJars).value; (compile in Compile).value;
}
(gae_clean, after) {
(clean, task) => clean doFinally task
}
}
As of now, this does not work, there is no error, but there is no effect or conclusion; if i change :=to <<=, it works. My SBT version is 0.13.0 and uses Scala 2.10.2.
Edit2:
, := , .value :
gae_prep_war := {
val after = Def.task {
(gae_copyJars).value; (compile in Compile).value;
}
(gae_clean, after) {
(clean, task) => clean doFinally task
}
}.value
^
, ...