diff --git a/os/src-jvm/ProcessOps.scala b/os/src-jvm/ProcessOps.scala
index 981b6521..3766bb78 100644
--- a/os/src-jvm/ProcessOps.scala
+++ b/os/src-jvm/ProcessOps.scala
@@ -81,8 +81,8 @@ case class proc(command: Shellable*) {
 
     sub.join(timeout)
 
-    val chunksArr = chunks.iterator.asScala.toArray
-    val res = CommandResult(commandChunks, sub.exitCode(), chunksArr)
+    val chunksSeq = chunks.iterator.asScala.toIndexedSeq
+    val res = CommandResult(commandChunks, sub.exitCode(), chunksSeq)
     if (res.exitCode == 0 || !check) res
     else throw SubprocessException(res)
   }
diff --git a/os/src-jvm/ResourcePath.scala b/os/src-jvm/ResourcePath.scala
index cb97dde2..9a42de5f 100644
--- a/os/src-jvm/ResourcePath.scala
+++ b/os/src-jvm/ResourcePath.scala
@@ -2,6 +2,7 @@ package os
 
 import java.io.InputStream
 
+import scala.language.implicitConversions
 
 object ResourcePath{
   def resource(resRoot: ResourceRoot) = {
@@ -21,7 +22,7 @@ class ResourcePath private[os](val resRoot: ResourceRoot, segments0: Array[Strin
     case stream => stream
   }
   def toSource = new Source.WritableSource(getInputStream)
-  val segments: IndexedSeq[String] = segments0
+  val segments: IndexedSeq[String] = segments0.toIndexedSeq
   type ThisType = ResourcePath
   def lastOpt = segments0.lastOption
   override def toString = resRoot.errorName + "/" + segments0.mkString("/")
diff --git a/os/src-jvm/SubProcess.scala b/os/src-jvm/SubProcess.scala
index ac28d1c7..f8f36ffb 100644
--- a/os/src-jvm/SubProcess.scala
+++ b/os/src-jvm/SubProcess.scala
@@ -3,6 +3,8 @@ package os
 import java.io._
 import java.util.concurrent.TimeUnit
 
+import scala.language.implicitConversions
+
 /**
   * Represents a spawn subprocess that has started and may or may not have
   * completed.
diff --git a/os/src-jvm/package.scala b/os/src-jvm/package.scala
index 08553a24..479ecd84 100644
--- a/os/src-jvm/package.scala
+++ b/os/src-jvm/package.scala
@@ -1,4 +1,6 @@
 
+import scala.language.implicitConversions
+
 package object os{
   type Generator[+T] = geny.Generator[T]
   val Generator = geny.Generator
diff --git a/os/src/ListOps.scala b/os/src/ListOps.scala
index 7268d234..e14fa084 100644
--- a/os/src/ListOps.scala
+++ b/os/src/ListOps.scala
@@ -15,12 +15,12 @@ import java.nio.file.attribute.BasicFileAttributes
   * them. You can disable sorted by passing in the flag `sort = false`.
   */
 object list extends Function1[Path, IndexedSeq[Path]] {
-  def apply(src: Path, sort: Boolean = true) = {
+  def apply(src: Path, sort: Boolean = true): IndexedSeq[Path] = {
     val arr = stream(src).toArray[Path]
     if (sort) arr.sorted
     else arr
   }
-  def apply(src: Path) = apply(src, true)
+  def apply(src: Path): IndexedSeq[Path] = apply(src, true).toIndexedSeq
 
   /**
     * Similar to [[os.list]]], except provides a [[os.Generator]] of results
@@ -90,7 +90,7 @@ object walk {
             followLinks: Boolean = false,
             maxDepth: Int = Int.MaxValue,
             includeTarget: Boolean = false): IndexedSeq[Path] = {
-    stream(path, skip, preOrder, followLinks, maxDepth, includeTarget).toArray[Path]
+    stream(path, skip, preOrder, followLinks, maxDepth, includeTarget).toArray[Path].toIndexedSeq
   }
 
   /**
@@ -122,7 +122,7 @@ object walk {
             maxDepth: Int = Int.MaxValue,
             includeTarget: Boolean = false): IndexedSeq[(Path, os.StatInfo)] = {
     stream.attrs(path, skip, preOrder, followLinks, maxDepth, includeTarget)
-      .toArray[(Path, os.StatInfo)]
+      .toArray[(Path, os.StatInfo)].toIndexedSeq
   }
 
   object stream {
diff --git a/os/src/Model.scala b/os/src/Model.scala
index 0a35d19a..9601fce4 100644
--- a/os/src/Model.scala
+++ b/os/src/Model.scala
@@ -221,7 +221,7 @@ object Shellable{
     Shellable(s.toSeq.flatMap(f(_).value))
 
   implicit def ArrayShellable[T](s: Array[T])(implicit f: T => Shellable): Shellable =
-    Shellable(s.flatMap(f(_).value))
+    Shellable(s.toIndexedSeq.flatMap(f(_).value))
 }
 
 /**
diff --git a/os/src/Path.scala b/os/src/Path.scala
index ecc8a1ed..9580c798 100644
--- a/os/src/Path.scala
+++ b/os/src/Path.scala
@@ -1,6 +1,7 @@
 package os
 
 import collection.JavaConverters._
+import scala.language.implicitConversions
 
 trait PathChunk{
   def segments: Seq[String]
@@ -30,7 +31,7 @@ object PathChunk{
     override def toString() = s.name
   }
   implicit class ArrayPathChunk[T](a: Array[T])(implicit f: T => PathChunk) extends PathChunk {
-    val inner = SeqPathChunk(a)(f)
+    val inner = SeqPathChunk(a.toIndexedSeq)(f)
     def segments = inner.segments
     def ups = inner.ups
 
@@ -250,7 +251,7 @@ object FilePath {
 class RelPath private[os](segments0: Array[String], val ups: Int)
   extends FilePath with BasePathImpl with SegmentedPath {
   def lastOpt = segments.lastOption
-  val segments: IndexedSeq[String] = segments0
+  val segments: IndexedSeq[String] = segments0.toIndexedSeq
   type ThisType = RelPath
   require(ups >= 0)
   protected[this] def make(p: Seq[String], ups: Int) = {
@@ -316,14 +317,15 @@ object RelPath {
 class SubPath private[os](val segments0: Array[String])
   extends FilePath with BasePathImpl with SegmentedPath {
   def lastOpt = segments.lastOption
-  val segments: IndexedSeq[String] = segments0
+  val segments: IndexedSeq[String] = segments0.toIndexedSeq
   type ThisType = SubPath
   protected[this] def make(p: Seq[String], ups: Int) = {
     require(ups == 0)
     new SubPath(p.toArray[String])
   }
 
-  def relativeTo(base: SubPath): RelPath = SubPath.relativeTo0(segments0, base.segments0)
+  def relativeTo(base: SubPath): RelPath =
+    SubPath.relativeTo0(segments0, base.segments0.toIndexedSeq)
 
   def startsWith(target: SubPath) = this.segments0.startsWith(target.segments)
 
diff --git a/os/src/ReadWriteOps.scala b/os/src/ReadWriteOps.scala
index e2f7c168..0db00746 100644
--- a/os/src/ReadWriteOps.scala
+++ b/os/src/ReadWriteOps.scala
@@ -327,9 +327,9 @@ object read extends Function1[ReadablePath, String]{
     * can override by specifying a `charSet`.
     */
   object lines extends Function1[ReadablePath, IndexedSeq[String]]{
-    def apply(src: ReadablePath) = stream(src).toArray[String]
+    def apply(src: ReadablePath): IndexedSeq[String] = stream(src).toArray[String].toIndexedSeq
     def apply(arg: ReadablePath, charSet: Codec): IndexedSeq[String] =
-      stream(arg, charSet).toArray[String]
+      stream(arg, charSet).toArray[String].toIndexedSeq
 
     /**
       * Identical to [[os.read.lines]], but streams the results back to you
diff --git a/os/src/Source.scala b/os/src/Source.scala
index 96feade7..641b521a 100644
--- a/os/src/Source.scala
+++ b/os/src/Source.scala
@@ -15,6 +15,7 @@ import java.nio.channels.{
   WritableByteChannel
 }
 
+import scala.language.implicitConversions
 
 /**
   * A source of bytes; must provide either an [[InputStream]] or a
diff --git a/os/test/src-jvm/ExampleTests.scala b/os/test/src-jvm/ExampleTests.scala
index 70e41c83..0ae13b34 100644
--- a/os/test/src-jvm/ExampleTests.scala
+++ b/os/test/src-jvm/ExampleTests.scala
@@ -271,7 +271,7 @@ object ExampleTests extends TestSuite{
             .filter(_._2.length > 0)
             .filter(!_._1.segments.contains("src_managed"))
 
-      assert(filesWithTooLongLines.length == 0)
+      Predef.assert(filesWithTooLongLines.length == 0, filesWithTooLongLines)
     }
     test("rename"){
 //      val d1/"omg"/x1 = wd
diff --git a/os/test/src-jvm/SubprocessTests.scala b/os/test/src-jvm/SubprocessTests.scala
index d5f50fb5..298be804 100644
--- a/os/test/src-jvm/SubprocessTests.scala
+++ b/os/test/src-jvm/SubprocessTests.scala
@@ -11,11 +11,11 @@ import scala.collection.mutable
 object SubprocessTests extends TestSuite{
   val scriptFolder = pwd/"os"/"test"/"resources"/"test"
 
-  val lsCmd = if(scala.util.Properties.isWin) "dir" else "ls"
+  val lsCmd = if (scala.util.Properties.isWin) "dir" else "ls"
 
   val tests = Tests {
     test("lines"){
-      val res = proc(lsCmd, scriptFolder).call()
+      val res = TestUtil.proc(lsCmd, scriptFolder).call()
       assert(
         res.out.lines().exists(_.contains("File.txt")),
         res.out.lines().exists(_.contains("folder1")),
@@ -23,11 +23,11 @@ object SubprocessTests extends TestSuite{
       )
     }
     test("string"){
-      val res = proc(lsCmd, scriptFolder).call()
+      val res = TestUtil.proc(lsCmd, scriptFolder).call()
       assert(
-        res.out.string().contains("File.txt"),
-        res.out.string().contains("folder1"),
-        res.out.string().contains("folder2")
+        res.out.text().contains("File.txt"),
+        res.out.text().contains("folder1"),
+        res.out.text().contains("folder2")
       )
     }
     test("bytes"){
@@ -39,33 +39,33 @@ object SubprocessTests extends TestSuite{
     }
     test("chained"){
       assert(
-        proc("git", "init").call().out.string().contains("Reinitialized existing Git repository"),
-        proc("git", "init").call().out.string().contains("Reinitialized existing Git repository"),
-        proc(lsCmd, pwd).call().out.string().contains("readme.md")
+        proc("git", "init").call().out.text().contains("Reinitialized existing Git repository"),
+        proc("git", "init").call().out.text().contains("Reinitialized existing Git repository"),
+        TestUtil.proc(lsCmd, pwd).call().out.text().contains("readme.md")
       )
     }
     test("basicList"){
       val files = List("readme.md", "build.sc")
-      val output = proc(lsCmd, files).call().out.string()
+      val output = TestUtil.proc(lsCmd, files).call().out.text()
       assert(files.forall(output.contains))
     }
     test("listMixAndMatch"){
       val stuff = List("I", "am", "bovine")
       val result = TestUtil.proc("echo", "Hello,", stuff, "hear me roar").call()
       if(Unix())
-        assert(result.out.string().contains("Hello, " + stuff.mkString(" ") + " hear me roar"))
+        assert(result.out.text().contains("Hello, " + stuff.mkString(" ") + " hear me roar"))
       else // win quotes multiword args
-        assert(result.out.string().contains("Hello, " + stuff.mkString(" ") + " \"hear me roar\""))
+        assert(result.out.text().contains("Hello, " + stuff.mkString(" ") + " \"hear me roar\""))
     }
     test("failures"){
       val ex = intercept[os.SubprocessException]{
-        proc(lsCmd, "does-not-exist").call(check = true, stderr = os.Pipe)
+        TestUtil.proc(lsCmd, "does-not-exist").call(check = true, stderr = os.Pipe)
       }
       val res: CommandResult = ex.result
       assert(
         res.exitCode != 0,
-        res.err.string().contains("No such file or directory") || // unix
-          res.err.string().contains("File Not Found") // win
+        res.err.text().contains("No such file or directory") || // unix
+          res.err.text().contains("File Not Found") // win
       )
     }
 
@@ -78,7 +78,7 @@ object SubprocessTests extends TestSuite{
             env = Map("ENV_ARG" -> "123")
           )
 
-        assert(res.out.string().trim()== "Hello123")
+        assert(res.out.text().trim()== "Hello123")
       }
     }
     test("filebased2"){
@@ -86,7 +86,7 @@ object SubprocessTests extends TestSuite{
         val possiblePaths = Seq(root / "bin",
                                 root / "usr" / "bin").map { pfx => pfx / "echo" }
         val res = proc("which", "echo").call()
-        val echoRoot = Path(res.out.string().trim())
+        val echoRoot = Path(res.out.text().trim())
         assert(possiblePaths.contains(echoRoot))
 
         assert(proc(echoRoot, "HELLO").call().out.lines() == Seq("HELLO"))
@@ -121,14 +121,14 @@ object SubprocessTests extends TestSuite{
           |    # Vary how close they are together to try and trigger race conditions
           |    time.sleep(0.00001 * i)
           |    sys.stdout.flush()
-        """.stripMargin).call().out.string() ==>
+        """.stripMargin).call().out.text() ==>
           "01234567890123456789012345678901234567890123456789"
       }}
       test("jarTf"){
         // This was the original repro for the multi-chunk concurrency bugs
         val jarFile = os.pwd / "os" / "test" / "resources" / "misc" / "out.jar"
         assert(TestUtil.eqIgnoreNewlineStyle(
-          os.proc("jar", "-tf", jarFile).call().out.string(),
+          os.proc("jar", "-tf", jarFile).call().out.text(),
           """META-INF/MANIFEST.MF
             |test/FooTwo.class
             |test/Bar.class
@@ -141,15 +141,15 @@ object SubprocessTests extends TestSuite{
       }
     }
     test("workingDirectory"){
-      val listed1 = proc(lsCmd).call(cwd = pwd)
-      val listed2 = proc(lsCmd).call(cwd = pwd / up)
+      val listed1 = TestUtil.proc(lsCmd).call(cwd = pwd)
+      val listed2 = TestUtil.proc(lsCmd).call(cwd = pwd / up)
 
       assert(listed2 != listed1)
     }
     test("customWorkingDir"){
-      val res1 = proc(lsCmd).call(cwd = pwd) // explicitly
+      val res1 = TestUtil.proc(lsCmd).call(cwd = pwd) // explicitly
       // or implicitly
-      val res2 = proc(lsCmd).call()
+      val res2 = TestUtil.proc(lsCmd).call()
     }
 
     test("fileCustomWorkingDir"){
diff --git a/os/watch/src/CarbonApi.scala b/os/watch/src/CarbonApi.scala
index be67fa9a..1a607813 100644
--- a/os/watch/src/CarbonApi.scala
+++ b/os/watch/src/CarbonApi.scala
@@ -5,7 +5,7 @@ import com.sun.jna._
 import com.sun.jna.ptr.PointerByReference
 
 object CarbonApi {
-  val INSTANCE = Native.loadLibrary("Carbon", classOf[CarbonApi]).asInstanceOf[CarbonApi]
+  val INSTANCE = Native.load("Carbon", classOf[CarbonApi]).asInstanceOf[CarbonApi]
 }
 
 trait FSEventStreamCallback extends Callback {