Selectively escalate warnings to errors: -Xfatal-warnings with a whitelist.

Add the following to the project/plugin.sbt:

addSbtPlugin("net.team2xh" % "sbt-lethal-warnings" % "[Version in badge above]")

In build.sbt, configure which warnings need to be escalated to errors:

import sbt.LethalWarnings._
lethalWarnings := Seq(/* Desired warnings */)

To lethalize all warnings supported by the plugin, use the following setting:

lethalWarnings := allWarnings

Tests are using scripted SBT and scripted-scalatest to run a nested SBT instance compiling the project located at src/sbt-test/sbt-lethal-warnings/test-warnings/. To execute the test suite, run the following from the root of the project:

sbt scripted