fix 2.12 previous

Author: johnynek

build.sbt

@@ -126,7 +126,7 @@ val unreleasedModules = Set[String]("akka")
 val javaOnly = Set[String]("storm", "java", "hadoop", "thrift", "protobuf")
 val binaryCompatVersion = "0.8.1"
 
-def youngestForwardCompatible(subProj: String) =
+def youngestForwardCompatible(subProj: String, scalaver: String) =
   Some(subProj)
     .filterNot(unreleasedModules.contains(_))
     .map { s =>
@@ -135,6 +135,7 @@ def youngestForwardCompatible(subProj: String) =
     else
       "com.twitter" %% ("chill-" + s) % binaryCompatVersion
   }
+  .filterNot(_ => scalaver.startsWith("2.12")) // 2.12 0.8.1 was not there
 
 val ignoredABIProblems = {
   import com.typesafe.tools.mima.core._
@@ -148,7 +149,7 @@ def module(name: String) = {
   val id = "chill-%s".format(name)
   Project(id = id, base = file(id), settings = sharedSettings ++ Seq(
     Keys.name := id,
-    mimaPreviousArtifacts := youngestForwardCompatible(name).toSet,
+    mimaPreviousArtifacts := youngestForwardCompatible(name, scalaVersion.value).toSet,
     mimaBinaryIssueFilters ++= ignoredABIProblems,
     // Disable cross publishing for java artifacts
     publishArtifact :=