String interpolation bug fix

This change fixes a bug in class StringContext.scala.
Parts were not correctly added to the resulting string.

This commit includes a test case which covers the
example reported in the bug.

Closes SI-5614.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/library/scala/StringContext.scala b/src/library/scala/StringContext.scala
index 1b01355108..882451680a 100644
--- a/src/library/scala/StringContext.scala
+++ b/src/library/scala/StringContext.scala
@@ -144,7 +144,7 @@ object StringContext {
     var cur = 0
     var idx = 0
     def output(ch: Char) = {
-      bldr append str substring (start, cur)
+      bldr append str.substring (start, cur)
       bldr append ch
       start = idx
     }