Fixed a booch I made in io.Position's positioning.

Closes #4498, no review.

3 files changed, 14 insertions, 1 deletions

diff --git a/src/library/scala/io/Position.scala b/src/library/scala/io/Position.scala
index 5b6accfea3..917d61ec25 100644
--- a/src/library/scala/io/Position.scala
+++ b/src/library/scala/io/Position.scala
@@ -51,7 +51,7 @@ abstract class Position {
     if (line >= LINE_MASK)
       LINE_MASK << COLUMN_BITS
     else
-      (line << COLUMN_BITS) | math.min(LINE_MASK, line)
+      (line << COLUMN_BITS) | math.min(COLUMN_MASK, column)
   }
 
   /** Returns the line number of the encoded position. */
diff --git a/test/files/run/io-position.check b/test/files/run/io-position.check
new file mode 100644
index 0000000000..09f743d750
--- /dev/null
+++ b/test/files/run/io-position.check
diff --git a/test/files/run/io-position.scala b/test/files/run/io-position.scala
new file mode 100644
index 0000000000..7e570ea29e
--- /dev/null
+++ b/test/files/run/io-position.scala
@@ -0,0 +1,13 @@
+object Test {
+  Console.setErr(Console.out)
+
+  def main(args: Array[String]): Unit = {
+    try {
+      xml.parsing.ConstructingParser.fromSource(io.Source.fromString("<foo>"), false).document()
+    } catch {
+      case e:Exception => println(e.getMessage)
+    }
+  }
+
+}
+