LinterLevel

 val foo = taskKey[Unit]("")
 val bar = taskKey[Unit]("")
 // This compiles because of the import in the block
 val fooTask = {
   import sbt.dsl.LinterLevel.Ignore
   Def.task {
     if (true) bar.value
     else bar.value
   }
 }
 // because the import above was in a local scope, it does not apply here, so this won't
 // compile:
 //val barTask = Def.task {
 //  if (true) foo.value
 //  else foo.value
 //}

 import sbt.dsl.LinterLevel.Ignore
 // Both defs compile because the Ignore LinterLevel is implicitly brought into scope and
 // picked up by both task defs underneath
 val newFooTask = Def.task {
   if (true) bar.value
   else bar.value
 }
 val barTask = Def.task {
   if (true) foo.value
   else foo.value
 }