diff --git a/.travis.yml b/.travis.yml
index 1594d962..7742a4fc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,9 +4,13 @@ sudo: false
 
 language: scala
 
+addons:
+  hosts:
+    - myshorthost
+  hostname: myshorthost
+
 env:
   global:
-    - PUBLISH_JDK=openjdk6
     # PGP_PASSPHRASE
     - secure: "SkBtn/6OjEldoikn0MFuyeLT/pau27kwKSDYTVQeJ4BKDzdWLwLE5Q3RukLGttIfNdhOvRoocpQSW9GkZfibTHmwrRnAokucfZCqTsKbwoOp1xIoOh5GrrVrB6gcP7WBTKinqFdBgSvLOrP7GviImz4ZuB9wq1r+mToGG4pDrXc="
     # SONA_USER
@@ -18,7 +22,6 @@ script: admin/build.sh
 
 jdk:
   - openjdk6
-  - openjdk7
   - oraclejdk8
 
 notifications:
diff --git a/admin/README.md b/admin/README.md
index 55ae9c8a..7f38379a 100644
--- a/admin/README.md
+++ b/admin/README.md
@@ -19,7 +19,7 @@ To configure tag driven releases from Travis CI.
      Edit `.travis.yml` as prompted.
   4. Edit `.travis.yml` to use `./admin/build.sh` as the build script,
      and edit that script to use the tasks required for this project.
-  5. Edit `.travis.yml` to select which JDK will be used for publishing.
+  5. Edit `build.sbt` to select which JDK will be used for publishing.
 
 It is important to add comments in .travis.yml to identify the name
 of each environment variable encoded in a `:secure` section.
@@ -30,7 +30,6 @@ form:
 	language: scala
 	env:
 	  global:
-	    - PUBLISH_JDK=openjdk6
 	    # PGP_PASSPHRASE
 	    - secure: "XXXXXX"
 	    # SONA_USER
diff --git a/admin/build.sh b/admin/build.sh
index ddd6d5e0..ce76249d 100755
--- a/admin/build.sh
+++ b/admin/build.sh
@@ -7,7 +7,7 @@ set -e
 # git on travis does not fetch tags, but we have TRAVIS_TAG
 # headTag=$(git describe --exact-match ||:)
 
-if [ "$TRAVIS_JDK_VERSION" == "$PUBLISH_JDK" ] && [[ "$TRAVIS_TAG" =~ ^v[0-9]+\.[0-9]+\.[0-9]+(-[A-Za-z0-9-]+)? ]]; then
+if [[ "$TRAVIS_TAG" =~ ^v[0-9]+\.[0-9]+\.[0-9]+(-[A-Za-z0-9-]+)? ]]; then
   echo "Going to release from tag $TRAVIS_TAG!"
   myVer=$(echo $TRAVIS_TAG | sed -e s/^v//)
   publishVersion='set every version := "'$myVer'"'
diff --git a/build.sbt b/build.sbt
index 3ff98463..7b11f41e 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,19 +1,34 @@
 scalaVersion in ThisBuild := crossScalaVersions.value.head
 
 crossScalaVersions in ThisBuild := {
+  val v211 = List("2.11.8")
+  val v212 = List("2.12.0-RC1")
+
   val javaVersion = System.getProperty("java.version")
-  val isJDK6Or7 =
-    javaVersion.startsWith("1.6.") || javaVersion.startsWith("1.7.")
-  if (isJDK6Or7)
-    Seq("2.11.7")
-  else
-    Seq("2.11.7", "2.12.0-M3")
+  val isTravisPublishing = !util.Properties.envOrElse("TRAVIS_TAG", "").trim.isEmpty
+
+  if (isTravisPublishing) {
+    if (javaVersion.startsWith("1.6.")) v211
+    else if (javaVersion.startsWith("1.8.")) v212
+    else Nil
+  } else if (javaVersion.startsWith("1.6.") || javaVersion.startsWith("1.7.")) {
+    v211
+  } else if (javaVersion.startsWith("1.8.") || javaVersion.startsWith("9")) {
+    v211 ++ v212
+  } else {
+    sys.error(s"Unsupported java version: $javaVersion.")
+  }
 }
 
 lazy val `scala-parser-combinators` = crossProject.in(file(".")).
   settings(scalaModuleSettings: _*).
+  settings(
+    name := "scala-parser-combinators-root"
+  ).
   jvmSettings(
-    name := "scala-parser-combinators-jvm"
+    // Mima uses the name of the jvm project in the artifactId
+    // when resolving previous versions (so no "-jvm" project)
+    name := "scala-parser-combinators"
   ).
   jsSettings(
     name := "scala-parser-combinators-js"
@@ -38,10 +53,10 @@ lazy val `scala-parser-combinators` = crossProject.in(file(".")).
   ).
   jsConfigure(_.enablePlugins(ScalaJSJUnitPlugin)).
   jvmSettings(
-    libraryDependencies += "junit" % "junit" % "4.11" % "test",
-    libraryDependencies += "com.novocode" % "junit-interface" % "0.10" % "test"
+    libraryDependencies += "junit" % "junit" % "4.12" % "test",
+    libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % "test"
   ).
-  settings(
+  jvmSettings(
     mimaPreviousVersion := None
   )
 
diff --git a/js/src/main/scala/scala/util/parsing/input/PositionCache.scala b/js/src/main/scala/scala/util/parsing/input/PositionCache.scala
new file mode 100644
index 00000000..ff9f144f
--- /dev/null
+++ b/js/src/main/scala/scala/util/parsing/input/PositionCache.scala
@@ -0,0 +1,14 @@
+package scala.util.parsing.input
+
+import java.lang.CharSequence
+import java.util.{AbstractMap, Collections}
+
+private[input] trait PositionCache {
+  private[input] lazy val indexCache: java.util.Map[CharSequence,Array[Int]] = new AbstractMap[CharSequence, Array[Int]] {
+
+    override def entrySet() = Collections.emptySet()
+
+    // the /dev/null of Maps
+    override def put(ch: CharSequence, a: Array[Int]) = null
+  }
+}
diff --git a/jvm/src/main/scala/scala/util/parsing/input/PositionCache.scala b/jvm/src/main/scala/scala/util/parsing/input/PositionCache.scala
new file mode 100644
index 00000000..84b1edfb
--- /dev/null
+++ b/jvm/src/main/scala/scala/util/parsing/input/PositionCache.scala
@@ -0,0 +1,17 @@
+package scala.util.parsing.input
+
+import java.lang.{CharSequence, ThreadLocal}
+import java.util.WeakHashMap
+
+/**
+ * @author Tomáš Janoušek
+ */
+private[input] trait PositionCache {
+  private lazy val indexCacheTL =
+    // not DynamicVariable as that would share the map from parent to child :-(
+    new ThreadLocal[java.util.Map[CharSequence, Array[Int]]] {
+      override def initialValue = new WeakHashMap[CharSequence, Array[Int]]
+    }
+
+  private[input] def indexCache = indexCacheTL.get
+}
diff --git a/jvm/src/test/scala/scala/util/parsing/combinator/t9010.scala b/jvm/src/test/scala/scala/util/parsing/combinator/t9010.scala
new file mode 100644
index 00000000..61fafd3d
--- /dev/null
+++ b/jvm/src/test/scala/scala/util/parsing/combinator/t9010.scala
@@ -0,0 +1,51 @@
+import scala.util.parsing.combinator._
+import scala.util.DynamicVariable
+
+import org.junit.Test
+
+class t9010 {
+  @Test
+  def test: Unit = {
+    val p = new grammar
+    val lastNoSuccessVar = getLastNoSuccessVar(p)
+    import p._
+
+    val res1 = parse(x, "x")
+    assert(res1.successful)
+    assert(lastNoSuccessVar.value == None)
+
+    val res2 = parse(x, "y")
+    assert(!res2.successful)
+    assert(lastNoSuccessVar.value == None)
+
+    val res3 = parseAll(x, "x")
+    assert(res3.successful)
+    assert(lastNoSuccessVar.value == None)
+
+    val res4 = parseAll(x, "y")
+    assert(!res4.successful)
+    assert(lastNoSuccessVar.value == None)
+  }
+
+  private def getLastNoSuccessVar(p: Parsers): DynamicVariable[Option[_]] = {
+    // use java reflection instead of scala (see below) because of
+    // https://issues.scala-lang.org/browse/SI-9306
+    val fn = "scala$util$parsing$combinator$Parsers$$lastNoSuccessVar"
+    val f = p.getClass.getDeclaredMethod(fn)
+    f.setAccessible(true)
+    f.invoke(p).asInstanceOf[DynamicVariable[Option[_]]]
+
+    /*
+    val ru = scala.reflect.runtime.universe
+    val mirror = ru.runtimeMirror(getClass.getClassLoader)
+    val lastNoSuccessVarField =
+      ru.typeOf[Parsers].decl(ru.TermName("lastNoSuccessVar")).asTerm.accessed.asTerm
+    mirror.reflect(p).reflectField(lastNoSuccessVarField).get.
+      asInstanceOf[DynamicVariable[Option[_]]]
+    */
+  }
+
+  private final class grammar extends RegexParsers {
+    val x: Parser[String] = "x"
+  }
+}
diff --git a/project/build.properties b/project/build.properties
index a6e117b6..35c88bab 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=0.13.8
+sbt.version=0.13.12
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 9eb822e3..983683a9 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,3 +1,3 @@
-addSbtPlugin("org.scala-lang.modules" % "scala-module-plugin" % "1.0.3")
+addSbtPlugin("org.scala-lang.modules" % "scala-module-plugin" % "1.0.4")
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.6")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.12")
diff --git a/shared/src/main/scala/scala/util/parsing/combinator/Parsers.scala b/shared/src/main/scala/scala/util/parsing/combinator/Parsers.scala
index 9fd60b3b..882b8970 100644
--- a/shared/src/main/scala/scala/util/parsing/combinator/Parsers.scala
+++ b/shared/src/main/scala/scala/util/parsing/combinator/Parsers.scala
@@ -156,14 +156,19 @@ trait Parsers {
     val successful = true
   }
 
-  private lazy val lastNoSuccessVar = new DynamicVariable[Option[NoSuccess]](None)
+  /* two layers of Option:
+   *  outer Option is None if lastNoSuccess tracking is disabled (outside of
+   *               phrase) and Some if tracking is enabled
+   *  inner Option is None if NoSuccess hasn't been seen yet, Some otherwise
+   * this is necessary to avoid leaking NoSuccesses in thread locals */
+  private lazy val lastNoSuccessVar = new DynamicVariable[Option[Option[NoSuccess]]](None)
 
   /** A common super-class for unsuccessful parse results. */
   sealed abstract class NoSuccess(val msg: String, override val next: Input) extends ParseResult[Nothing] { // when we don't care about the difference between Failure and Error
     val successful = false
 
-    if (lastNoSuccessVar.value forall (v => !(next.pos < v.next.pos)))
-      lastNoSuccessVar.value = Some(this)
+    if (lastNoSuccessVar.value exists (_ forall (v => !(next.pos < v.next.pos))))
+      lastNoSuccessVar.value = Some(Some(this))
 
     def map[U](f: Nothing => U) = this
     def mapPartial[U](f: PartialFunction[Nothing, U], error: Nothing => String): ParseResult[U] = this
@@ -590,7 +595,7 @@ trait Parsers {
    *  @return a `tParser` that succeeds if `e` is the next available input.
    */
 
-  implicit def accept(e: Elem): Parser[Elem] = acceptIf(_ == e)("`"+e+"' expected but " + _ + " found")
+  implicit def accept(e: Elem): Parser[Elem] = acceptIf(_ == e)("'"+e+"' expected but " + _ + " found")
 
   /** A parser that matches only the given list of element `es`.
    *
@@ -908,14 +913,14 @@ trait Parsers {
    *           if `p` consumed all the input.
    */
   def phrase[T](p: Parser[T]) = new Parser[T] {
-    def apply(in: Input) = lastNoSuccessVar.withValue(None) {
+    def apply(in: Input) = lastNoSuccessVar.withValue(Some(None)) {
       p(in) match {
-      case s @ Success(out, in1) =>
-        if (in1.atEnd)
-          s
-        else
-          lastNoSuccessVar.value filterNot { _.next.pos < in1.pos } getOrElse Failure("end of input expected", in1)
-        case ns => lastNoSuccessVar.value.getOrElse(ns)
+        case s @ Success(out, in1) =>
+          if (in1.atEnd)
+            s
+          else
+            lastNoSuccessVar.value flatMap (_ filterNot { _.next.pos < in1.pos }) getOrElse Failure("end of input expected", in1)
+        case ns => lastNoSuccessVar.value.flatten.getOrElse(ns)
       }
     }
   }
diff --git a/shared/src/main/scala/scala/util/parsing/input/OffsetPosition.scala b/shared/src/main/scala/scala/util/parsing/input/OffsetPosition.scala
index 23f79c74..c69fc4d9 100644
--- a/shared/src/main/scala/scala/util/parsing/input/OffsetPosition.scala
+++ b/shared/src/main/scala/scala/util/parsing/input/OffsetPosition.scala
@@ -10,6 +10,8 @@ package scala
 package util.parsing.input
 
 import scala.collection.mutable.ArrayBuffer
+import java.lang.{CharSequence, ThreadLocal}
+import java.util.WeakHashMap
 
 /** `OffsetPosition` is a standard class for positions
  *   represented as offsets into a source ``document''.
@@ -19,10 +21,20 @@ import scala.collection.mutable.ArrayBuffer
  *
  * @author Martin Odersky
  */
-case class OffsetPosition(source: java.lang.CharSequence, offset: Int) extends Position {
+case class OffsetPosition(source: CharSequence, offset: Int) extends Position {
 
   /** An index that contains all line starts, including first line, and eof. */
   private lazy val index: Array[Int] = {
+    Option(OffsetPosition.indexCache.get(source)) match {
+      case Some(index) => index
+      case None =>
+        val index = genIndex
+        OffsetPosition.indexCache.put(source, index)
+        index
+    }
+  }
+
+  private def genIndex: Array[Int] = {
     val lineStarts = new ArrayBuffer[Int]
     lineStarts += 0
     for (i <- 0 until source.length)
@@ -50,8 +62,14 @@ case class OffsetPosition(source: java.lang.CharSequence, offset: Int) extends P
    *
    * @return the line at `offset` (not including a newline)
    */
-  def lineContents: String =
-    source.subSequence(index(line - 1), index(line)).toString
+  def lineContents: String = {
+    val endIndex = if (source.charAt(index(line) - 1) == '\n') {
+      index(line) -  1
+    } else {
+      index(line)
+    }
+    source.subSequence(index(line - 1), endIndex).toString
+  }
 
   /** Returns a string representation of the `Position`, of the form `line.column`. */
   override def toString = line+"."+column
@@ -71,3 +89,7 @@ case class OffsetPosition(source: java.lang.CharSequence, offset: Int) extends P
       this.line == that.line && this.column < that.column
   }
 }
+
+/** An object holding the index cache.
+ */
+object OffsetPosition extends scala.runtime.AbstractFunction2[CharSequence,Int,OffsetPosition] with PositionCache
diff --git a/shared/src/main/scala/scala/util/parsing/input/PagedSeqReader.scala b/shared/src/main/scala/scala/util/parsing/input/PagedSeqReader.scala
index 500c80c7..51e66943 100644
--- a/shared/src/main/scala/scala/util/parsing/input/PagedSeqReader.scala
+++ b/shared/src/main/scala/scala/util/parsing/input/PagedSeqReader.scala
@@ -30,10 +30,10 @@ object PagedSeqReader {
  * @author Martin Odersky
  */
 class PagedSeqReader(seq: PagedSeq[Char],
-                     override val offset: Int) extends Reader[Char] {
+                     override val offset: Int) extends Reader[Char] { outer =>
   import PagedSeqReader._
 
-  override lazy val source: java.lang.CharSequence = seq
+  override val source: java.lang.CharSequence = seq
 
   /** Construct a `PagedSeqReader` with its first element at
    *  `source(0)` and position `(1,1)`.
@@ -51,7 +51,9 @@ class PagedSeqReader(seq: PagedSeq[Char],
    *         otherwise, it's a `PagedSeqReader` containing the rest of input.
    */
   def rest: PagedSeqReader =
-    if (seq.isDefinedAt(offset)) new PagedSeqReader(seq, offset + 1)
+    if (seq.isDefinedAt(offset)) new PagedSeqReader(seq, offset + 1) {
+      override val source: java.lang.CharSequence = outer.source
+    }
     else this
 
   /** The position of the first element in the reader.
@@ -67,5 +69,7 @@ class PagedSeqReader(seq: PagedSeq[Char],
    *  `n` elements.
    */
   override def drop(n: Int): PagedSeqReader =
-    new PagedSeqReader(seq, offset + n)
+    new PagedSeqReader(seq, offset + n) {
+      override val source: java.lang.CharSequence = outer.source
+    }
 }
diff --git a/shared/src/test/scala/scala/util/parsing/combinator/PackratParsersTest.scala b/shared/src/test/scala/scala/util/parsing/combinator/PackratParsersTest.scala
index 5a7e6d2e..aec44bc0 100644
--- a/shared/src/test/scala/scala/util/parsing/combinator/PackratParsersTest.scala
+++ b/shared/src/test/scala/scala/util/parsing/combinator/PackratParsersTest.scala
@@ -122,7 +122,7 @@ class PackratParsersTest {
       val failure = parseResult.asInstanceOf[Failure]
       assertEquals(expectedFailureMsg, failure.msg)
     }
-    assertFailure("``b'' expected but `c' found", "a a a a b b b c c c c")
+    assertFailure("'`b'' expected but `c' found", "a a a a b b b c c c c")
     assertFailure("end of input", "a a a a b b b b c c c")
   }
 
diff --git a/shared/src/test/scala/scala/util/parsing/combinator/gh45.scala b/shared/src/test/scala/scala/util/parsing/combinator/gh45.scala
new file mode 100644
index 00000000..e184719a
--- /dev/null
+++ b/shared/src/test/scala/scala/util/parsing/combinator/gh45.scala
@@ -0,0 +1,46 @@
+package scala.util.parsing.combinator
+
+import scala.util.parsing.input._
+import scala.collection.immutable.PagedSeq
+
+import org.junit.Test
+import org.junit.Assert.assertTrue
+
+import scala.util.parsing.combinator.syntactical.StandardTokenParsers
+
+class gh45 {
+
+  @Test
+  def test4: Unit = {
+    def check(rd: Reader[Char]): Unit = {
+      val g = new grammar
+      val p = g.phrase(g.script)
+      val parseResult = p(new g.lexical.Scanner(rd))
+      assertTrue(parseResult.isInstanceOf[g.Success[_]])
+    }
+
+    val str = "x once y"
+    check(new CharSequenceReader(str))
+    /* Note that this only tests PagedSeq.rest since neither
+     * PackratReader nor lexical.Scanner override/use the drop method.
+     */
+    check(new PagedSeqReader(PagedSeq.fromStrings(List(str))))
+  }
+
+}
+
+private final class grammar extends StandardTokenParsers with PackratParsers {
+  lexical.reserved ++= List("x", "y", "z", "once")
+
+  var onceCnt: Int = 0
+  lazy val once: PackratParser[String] = memo("once") ^? {
+    case s if onceCnt == 0 =>
+      onceCnt += 1
+      s
+  }
+
+  lazy val script: PackratParser[Any] =
+    ( "x" ~ once ~ "z"
+    | "x" ~ once ~ "y"
+    )
+}
diff --git a/shared/src/test/scala/scala/util/parsing/combinator/gh56.scala b/shared/src/test/scala/scala/util/parsing/combinator/gh56.scala
new file mode 100644
index 00000000..34e1d551
--- /dev/null
+++ b/shared/src/test/scala/scala/util/parsing/combinator/gh56.scala
@@ -0,0 +1,57 @@
+package scala.util.parsing.combinator
+
+import org.junit.Assert.{assertEquals, assertTrue}
+import org.junit.Test
+
+import scala.util.parsing.combinator.syntactical.StandardTokenParsers
+
+/**
+  * Test for issue 56: https://github.com/scala/scala-parser-combinators/issues/56
+  *
+  * Makes sure that lineContents (and thus longString) in the Position trait doesn't
+  * include a newline
+  */
+class gh56 {
+  private object grammar extends StandardTokenParsers with PackratParsers {
+    lazy val term = (numericLit | stringLit | ident)+
+  }
+
+  @Test
+  def test1: Unit = {
+    import grammar._
+
+    val expr =
+      """/* an unclosed comment
+        |of multiple lines
+        |just to check longString/lineContents
+      """.stripMargin
+
+    val fail =
+      """[1.1] failure: identifier expected
+        |
+        |/* an unclosed comment
+        |^""".stripMargin
+
+    val parseResult = phrase(term)(new lexical.Scanner(expr))
+    assertTrue(parseResult.isInstanceOf[Failure])
+    assertEquals(fail, parseResult.toString)
+  }
+
+
+  @Test
+  def test2: Unit = {
+    import grammar._
+
+    val expr = "/* an unclosed comment without newline"
+
+    val fail =
+      """[1.1] failure: identifier expected
+        |
+        |/* an unclosed comment without newline
+        |^""".stripMargin
+
+    val parseResult = phrase(term)(new lexical.Scanner(expr))
+    assertTrue(parseResult.isInstanceOf[Failure])
+    assertEquals(fail, parseResult.toString)
+  }
+}