honor -encoding compiler flag and defaults

rename test/pos/valueclasses to pos_valueclasses

tests/pos/valueclasses generates a valueclasses.flags
file in /tests/partest-generated/pos that conflicts
with the valueClasses.flags file that
tests/neg/valueClasses.scala tries to create

3 files changed, 10 insertions, 5 deletions

diff --git a/src/dotty/tools/dotc/Run.scala b/src/dotty/tools/dotc/Run.scala
index 1a26748bf..fa69530b5 100644
--- a/src/dotty/tools/dotc/Run.scala
+++ b/src/dotty/tools/dotc/Run.scala
@@ -9,6 +9,7 @@ import Phases._
 import Decorators._
 import dotty.tools.dotc.transform.TreeTransforms.TreeTransformer
 import io.PlainFile
+import scala.io.Codec
 import util._
 import reporting.Reporter
 import transform.TreeChecker
@@ -28,8 +29,9 @@ class Run(comp: Compiler)(implicit ctx: Context) {
   var units: List[CompilationUnit] = _
 
   def getSource(fileName: String): SourceFile = {
+    val encoding = ctx.settings.encoding.value
     val f = new PlainFile(fileName)
-    if (f.exists) new SourceFile(f)
+    if (f.exists) new SourceFile(f, Codec(encoding))
     else {
       ctx.error(s"not found: $fileName")
       NoSource
@@ -113,7 +115,7 @@ class Run(comp: Compiler)(implicit ctx: Context) {
     val writer = new BufferedWriter(new OutputStreamWriter(virtualFile.output, "UTF-8")) // buffering is still advised by javadoc
     writer.write(sourceCode)
     writer.close()
-    compileSources(List(new SourceFile(virtualFile)))
+    compileSources(List(new SourceFile(virtualFile, Codec.UTF8)))
   }
 
   /** The context created for this run */
diff --git a/src/dotty/tools/dotc/config/Settings.scala b/src/dotty/tools/dotc/config/Settings.scala
index 73df4e1ec..cffa047fe 100644
--- a/src/dotty/tools/dotc/config/Settings.scala
+++ b/src/dotty/tools/dotc/config/Settings.scala
@@ -25,6 +25,8 @@ object Settings {
     private var values = ArrayBuffer(initialValues: _*)
     private var _wasRead: Boolean = false
 
+    override def toString = s"SettingsState(values: ${values.toList})"
+
     def value(idx: Int): Any = {
       _wasRead = true
       values(idx)
diff --git a/src/dotty/tools/dotc/util/SourceFile.scala b/src/dotty/tools/dotc/util/SourceFile.scala
index 6b547203e..344bc253a 100644
--- a/src/dotty/tools/dotc/util/SourceFile.scala
+++ b/src/dotty/tools/dotc/util/SourceFile.scala
@@ -10,6 +10,7 @@ import java.io.IOException
 import Chars._
 import ScriptSourceFile._
 import Positions._
+import scala.io.Codec
 
 import java.util.Optional
 
@@ -36,9 +37,9 @@ object ScriptSourceFile {
 
 case class SourceFile(file: AbstractFile, content: Array[Char]) extends interfaces.SourceFile {
 
-  def this(_file: AbstractFile)                 = this(_file, _file.toCharArray)
-  def this(sourceName: String, cs: Seq[Char])   = this(new VirtualFile(sourceName), cs.toArray)
-  def this(file: AbstractFile, cs: Seq[Char])   = this(file, cs.toArray)
+  def this(_file: AbstractFile, codec: Codec) = this(_file, new String(_file.toByteArray, codec.charSet).toCharArray)
+  def this(sourceName: String, cs: Seq[Char]) = this(new VirtualFile(sourceName), cs.toArray)
+  def this(file: AbstractFile, cs: Seq[Char]) = this(file, cs.toArray)
 
   /** Tab increment; can be overridden */
   def tabInc = 8