1 files changed, 5 insertions, 12 deletions
diff --git a/build.sbt b/build.sbt
index 8cdedb27..88d22088 100644
--- a/build.sbt
+++ b/build.sbt
@@ -39,6 +39,9 @@ lazy val commonSettings = Seq(
   scalacOptions := scalacOptionsVersion(scalaVersion.value) ++ Seq(
     "-deprecation",
     "-unchecked",
+    "-language:reflectiveCalls",
+    "-language:existentials",
+    "-language:implicitConversions",
     "-Yrangepos",          // required by SemanticDB compiler plugin
     "-Ywarn-unused-import" // required by `RemoveUnused` rule
   ),
@@ -132,19 +135,9 @@ lazy val publishSettings = Seq(
 lazy val docSettings = Seq(
   doc in Compile := (doc in ScalaUnidoc).value,
   autoAPIMappings := true,
-  apiMappings ++= {
-    Option(System.getProperty("sun.boot.class.path")).flatMap { classPath =>
-      classPath.split(java.io.File.pathSeparator).find(_.endsWith(java.io.File.separator + "rt.jar"))
-    }.map { jarPath =>
-      Map(
-        file(jarPath) -> url("https://docs.oracle.com/javase/8/docs/api")
-      )
-    }.getOrElse {
-      streams.value.log.warn("Failed to add bootstrap class path of Java to apiMappings")
-      Map.empty[File,URL]
-    }
-  },
   scalacOptions in Compile in doc ++= Seq(
+    "-Xfatal-warnings",
+    "-feature",
     "-diagrams",
     "-diagrams-max-classes", "25",
     "-doc-version", version.value,