SI-6370 changed ListMap apply0 method to produce correct error message when a key is not found

Current implementation of apply0 relies on tail method to iterate over all keys.
When the list gets to its end, tail produces an 'empty map' message in its exception, which is thrown by ListMap.
This change checks if the collection is empty before calling tail and provides a more appropriate key not found message.

Signed-off-by: Vinicius Miana <vinicius@miana.com.br>

1 files changed, 12 insertions, 0 deletions

diff --git a/test/files/run/t6370.scala b/test/files/run/t6370.scala
new file mode 100644
index 0000000000..c86b87dc8a
--- /dev/null
+++ b/test/files/run/t6370.scala
@@ -0,0 +1,12 @@
+object Test {
+
+  def main(args: Array[String]): Unit = {
+      val m = collection.immutable.ListMap( "x" -> 1 )
+      try {
+         m("y")
+      } catch {
+         case e : NoSuchElementException => assert(e.getMessage() == "key not found: y")
+      }
+
+  }
+}